Actinolite with sphalerite
This specimen from South Wales, Australia is composed of actinolite and sphalerite with actinolite as the main component...
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Actinolite, Selavastn.
Actinolite is a highly complex silicate, asbestos mineral with a formula too complicated for this short note...
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Agate geode, Dulcote hill.
This is a rather unusual specimen that has two major components, silica SiO2 and calcite CaCO3 It obviously started life as a silica geode...
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Agate, seam agate.
Agate is a variety of chalcedony, and is a silicon dioxide mineral SiO2 This polished specimen has been named as seam agate...
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Agate, tree agate.
Tree agate is a form of chalcedony, which is microcrystalline quartz. SiO2. It's proper name is dendritic quartz, or dendritic agate...
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Analcime, Croft quarry.
Analcime, Na(AlSi2O6) . H20 is a tectosilicate and classed as a zeolite. The specimen is from Croft quarry in Leicestershire...
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Ankerite/Ferroan dolomite, Eaglebrook mine.
Ankerite, Calcium, iron, magnesium, manganese, carbonate, Ca(Fe,Mg,Mn)(CO3)2. Eaglebrook mine, west Wales. Although I have listed this specimen as ankerite, it may well be Ferroan dolomite.
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Anthophylite, Czech republic.
Anthophylite, Mg2Mg5Si8O22(OH)2 is an amphibole mineral, and classed as an asbestos. In this specimen which is a concretion, a grey fibrous aggregate of anthophylite is surrounding a nodule of phlogopite mica.
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Antigorite, serpentine var.
This specimen, known as "precious serpentine" is a sub-species of antigorite, which in turn is one of several minerals in the serpentine family.
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Aragonite, Morocco.
Aragonite, calcium carbonate, CaCO3 has the same chemical composition as calcite, and vaterite. These three minerals are polymorphs of calcium carbonate, each with a different crystal lattice,
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Aragonite, Speeton
Aragonite, CaCO3 is a high pressure polymorph of Calcium carbonate. It is metastable near the earths surface, and will eventually decompose to the form of calcite.
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Aragonite.
Aragonite is calcium carbonate, Ca CO3. It has the same formula as calcite and vaterite, but has a different crystal lattice.
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Arsenopyrite. Hingston Down quarry.
Arsenopyrite is an iron arsenic sulphide FeAsS. With a content of 40 to 45% arsenic,
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Astrophyllite, Kola peninsula.
Astrophyllite is a highly complex mineral, a hydrous, potassium, iron, titanium, silicate. with a very complicated formula
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Astrophyllite.
Astrophyllite is a rare mineral. It is a potassium iron silicate with a very complicated formula
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Australian agates.
These agates were collected in the Coober Pedy area of Australia by the clubs co-founder Jim Nicholls. Coober Pedy is famous for the opals found there, but it seems that there is also a wide variety of agate.
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Azurite, Burra Burra.
Azurite, Cu3(CO3)2(OH)2 is a copper carbonate often found in association with malachite, which is chemically similar.
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Baryte from Sardinia.
Baryte is barium sulphide BaSO4 This a small specimen from Sardinia, perhaps not the best quality, but
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Baryte on calcite. Isle of Sheppey.
Baryte, BaSO4 Barium, sulphate. Specimens such as this one are very distinctive, and easily recognisable as coming from the Isle of Sheppey.
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Baryte vugh 1, Bryntail. (CWO)
Baryte, Barium sulphate, BaSO4. Bryntail mine, Nr. Llanidloes, Central Wales Orefield. Pinkish, platey crystals of baryte lining a vugh in
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Baryte vugh 2, Bryntail. (CWO)
Baryte, Barium sulphate, BaSO4. Bryntail mine, Nr.Llanidloes, Central Wales Orefield. Pinkish, platey crystals of baryte lining a vugh in a
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Baryte, Bryntail mine. (CWO)
Baryte, Barium sulphate, BaSO4. Bryntail mine, Central Wales Orefield. One half of a baryte nodule, broken
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Baryte, Bryntail. (CWO)
Baryte, Barium sulphate, BaSO4. Bryntail mine, Central Wales Orefield. A solid mass of intergrown bladed crystals.
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Baryte, Bryntail. (CWO)
Baryte, Barium sulphate, BaSO4. Bryntail mine, Nr Llanidloes, Central Wales Orefield. A few specimens recovered from
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Baryte, Gorn mine. (CWO)
Baryte, Barium sulphate, BaSO4. Gorn mine, Nr Llanidloes, Central Wales Orefield. These specimens were
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Baryte, Gorn mine. (CWO)
Baryte,Barium sulphate, BaSO4, Gorn mine, Nr. Llanidloes, Central Wales Orefield.
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Baryte, origin unknown.
Baryte is barium sulphate, BaSO4 baryte crystals can be of several different forms, tabular, massive, nodular, fibrous, or radiating. I am not keen on collecting specimens from unknown locations, but this
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Baryte, Pen y Clun. (CWO)
Baryte, Barium sulphate, BaSO4. Pen y Clun mine, Central Wales Orefield. Cream coloured massive baryte
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Baryte, Shelve
Baryte, BaSO4, Barium sulphide, is a common gangue mineral associated with lead ore deposits, and this applies
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Baryte,Bryntail. (CWO)
Baryte, Barium sulphate, BaSO4. Bryntail mine, Nr Llanidloes, Central Wales Orefield.
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Bauxite, Garrone, France.
Temporarily listed in the mineral collection, Bauxite is actually a rock that is the main ore of aluminium.It is composed of
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Beryl. Olary, Australia.
Beryl is a beryllium aluminium cyclosilicate with a formula of Be3Al2Si6O18 The best known varieties of beryl are emerald, aquamarine, and morganite ( pink beryl ) I
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Biotite mica. Cornwall.
Biotite is classified as a mineral, but is actually a common group of phyllosilicate minerals with the approximate formula of K(Mg,Fe)3AlSi3O10(F,OH)2
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Blue John,(Fluorite). Treak Cliff cavern,
Blue john is a variety of fluorite, CaF2 Calcium fluoride. The type locality for this mineral is Castleton in Derbyshire, and this
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Bornite.
Bornite often has an iridescent surface, and for this reason is popularly known as "Peacock ore" It is a sulphide mineral, composed of
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Brochantite, Australia.
Brochantite is a sulphate mineral, Cu4SO4(OH)6, often referred to as a secondary mineral of copper.
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Brochantite, Geufron. (CWO)
Brochantite, a cupric sulphate mineral,Cu4SO4(OH)6. Geufron mine, Central Wales Orefield.
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Brochantite, Great Orme.
Brochantite, Cu4(SO4)(OH)6 is a copper sulphate hydroxide mineral which forms in the oxidising zones of copper deposits.
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Calcite (dogtooth). Chihuahua,Mexico.
Calcite, CaCO3 This specimen of "dogtooth "calcite is from the Santa Eulalia mining district, Chihuahua, Mexico.
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Calcite ( precipitated ), Ystrad Meurig.
Calcite, CaCO3 Calcium carbonate in precipitated form. A little bit of a novelty in my collection, this specimen was first collected in liquid form,
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Calcite and Quartz, Nantiera. (CWO)
Calcite, CaCO3, and Quartz, SiO2. Nantiera mine, Central Wales Orefield. The specimens are predominately calcite
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Calcite cleavage planes, Tankerville.
Calcite, calcium carbonate, CaCO3 Although of little interest, this specimen is included in the collection, simply
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Calcite cleavage, Nantiago mine. (CWO)
Calcite, CaCO3. Nantiago mine, Central Wales Orefield. A wedge of calcite displaying cleavage
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Calcite dripstone,Siglenlas. (CWO)
Siglenlas mine, Central Wales Orefield. A delicate construction of precipitated calcite coating a piece of host rock,
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Calcite flat-bladed crystals 1, Nantiago. (CWO)
Calcite, Calcium carbonate, CaCO3. Nantiago mine, Central Wales Orefield. The bulk of this specimen is massive calcite.
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Calcite flat-bladed crystals 2, Nantiago. (CWO)
Calcite, Calcium carbonate, CaCO3. Nantiago mine, Central Wales Orefield. The uncommonly flat bladed crystals of calcite
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Calcite geode, Bridgenorth.
Calcite, calcium carbonate, CaCO3 I discovered this unusual geode in an excavation for industrial buildings in Bridgenorth,
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Calcite rhombohedral crystals, Nantiago. (CWO)
alcite, calcium carbonate, CaCO3. Nantiago mine, Central Wales Orefield. This particular specimen
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Calcite rhombs, Nantiago. (CWO)
Calcite, Calcium carbonate, CaCO3. Nantiago mine, Central Wales Orefield.
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Calcite vhug, Blaengwynlais.
Calcite is calcium Carbonate, CaCO3 and is widespread throughout Wales. Some of the best crystals are from limestone quarries in South Wales.
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Calcite, Colemans quarry.
Calcite, calcium carbonate, CaCO3 This simple specimen is part of a larger druse of scalenahedral crystals on a limestone base.
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Calcite, Cregiau quarry.
Calcite, calcium carbonate, CaCO3. This is one of several specimens collected from Cregiau quarry,
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Calcite, Creigiau quarry.
Calcite, calcium carbonate, CaCO3. Two more specimens of calcite from Creigiau quarry, South Wales.
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Calcite, Dylife. (CWO)
Calcite, Calcium carbonate, CaCO3. Dylife mine, Nr. Staylittle,
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Calcite, Llanfawr quarry.
Calcite, Calcium carbonate, CaCO3. Llanfawr quarry, Llandrindod Wells. From a fault in the quarry this specimen
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Calcite, massive, Snailbeach.
Calcite, CaCO3 calcium carbonate. There is nothing remarkable about this specimen.
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Calcite, nailhead var. NSW, Australia.
Calcite, Calcium carbonate , CaCO3 Calcite is a very common mineral, found in nearly all geologic environments.
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Calcite, Origin unknown.
Calcite, CaO3, Calcium carbonate. Calcite can be so varied in appearance
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Calcite, spherical.
Galcte, calcium carbonate, CaCO3. These spheres of calcite in a basalt cavity,
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Calcite, St Austell.
Calcite, calcium carbonate, CaCO3. Calcite comes in so many forms, that most specimens have an appearance
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Calcite, Taff's Well.
Calcite, calcium carbonate, CaCO3. Another specimen of calcite collected many years ago,
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Calcite, Taffs Well.
Calcite, Calcium carbonate, CaCO3 This specimen is one of many collected from Taffs Well quarry,
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Calcite, Ton Mawr.
Calcite, Calcium carbonate, CaCO3. This specimen is a fine cluster of creamy nailhead crystals on a limestone matrix.
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Calcite, Ton Mawr.
Another example of calcite crystals, again from one of the limestone quarries of South Wales.
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Calcite, twinned scalenahedral crystals, Creigau quarry.
Calcite, calcuium carbonate, CaCO3. Creigau quarry,
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Calcite, two specimens, Nantiago. (CWO)
Calcite, Calcium carbonate, CaCO3. Nantiago mine, Central Wales
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Calcite, Whately quarry.
Calcite, CaCO3 Calcium carbonate. This specimen is from Whately quarry near Wells in Somerset.
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Calcite. Blaengwynlais quarry.
Calcite, CaCO3 Calcium carbonate. There is nothing very special about this specimen,
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Calcite. Rorington.
Calcite, CaCO3, Calcium carbonate is a mineral that is very common
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Calcite. Ton Mawr quarry.
Calcite, calcium carbonate, CaCO3 This specimen was collected from Ton Mawr limestone quarry,
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Calcite. Tonfanau.
Calcite, Calcium carbonate, CaCO3 The club had a field trip to the coastal exposures at the small village of Tonfanau,
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Calcite/Galena, Madan,Bulgaria.
This is a pretty little specimen of Calcite CaO3 and galena PbS both of which are common hydrothermal minerals.
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Carborundum
I offer no apology for including carborundum in my collection. I saw the specimen on a market stall amidst the bric a brac priced at £10,
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Celestine, (Celestite), Erfoud.
Celestine, SrSO4 is strontium sulphate. Celestine is derived from the Latin word for celestial,
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Chalcedony, erratic.
Chalcedony. is a microcrystalline form of silica, SiO2. The silica is in two forms, quartz, and moganite, both of which have the same formula, but different crystal structures.
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Chalcedony, Normandy.
Chalcedony, SiO2 is a cryptocrystalline mineral formed from the intergrowth of two silica minerals, quartz and moganite.
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Chalcedony, Sahara desert.
This chalcedony geode is composed of cryptocrystalline quartz and moganite,
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Chalcopyrite, Dylife. (CWO)
Chalcopyrite, Copper iron sulphide, CuFeS2. Dylife mine spoil heaps, Nr. Staylittle, Central Wales Orefield.
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Chalcopyrite, Geufron. (CWO)
Chalcopyrite,Copper,iron sulphide.CuFeS2. Geufron mine, Central Wales Orefield. A nugget
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Chalcopyrite, Kellingly mine.
Chalcopyrite, CuFeS2 is a copper iron sulphide mineral. It is the most important ore of copper,
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Chalcopyrite,Siglenlas. (CWO)
Chalcopyrite, CeFeS2. Siglenlas mine, Nr. Llanidloes, Central Wales Orefield.
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Chrysocolla 1, Geufron. (CWO)
Chrysocolla, ia a hydrated copper phylosilicate mineral found in the weathering zones of copper deposits.Geufron mine,
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Chrysocolla 2, Geufron. (CWO)
Detail enlargement from chrysocolla 1. The globular nature of some of the encrustation is more apparent.
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Chrysocolla, Hafod Feddgar. (CWO)
Chrysocolla is a hydrated copper phyllosilicate mineral which can occur in the oxidation zone of copper ore deposits.
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Collectors Paradise.
There are so many minerals coming from Broken Hill in Australia
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Copper staining, Hafod Feddgar. (CWO)
Hafod Feddgar mine, Central Wales Orefield. The mine, having been closed for about 100 years,
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Damourite mica. Adelaide hills.
Damourite mica is a very fine grained variety of muscovite mica. KAl2(AlSi3O10)(OH)2 , and is described as an alteration mineral.
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Dolomite / Quartz, Penstrowed, Newtown.
Dolomite, CaMg(CO3)2 , and Quartz, SiO2, are featured in this rock from Penstrowed quarry, Newtown, .
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Dolomite / Quartz,Tan y Foel quarry.
Dolomite, CaMg(CO3)2. Tan y Foel quarry, Cefn Coch, Nr Welshpool, central Wales.
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Dolomite, Bryntail. (CWO)
Dolomite,CaMg(CO3)2. Bryntail mine, Central Wales Orefield. It is unusual to find such a well formed specimen of dolomite in the Central Wales Orefield.
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Dolomite, Sligo,Ireland.
Dolomite. CaMg(CO3)2 is an anhydrous carbonate mineral, sometimes referred to as dolostone.
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Epidote.
Epidote is a calcium aluminium iron sorosilicate mineral, with the formula Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH).
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Ferroan Dolomite,Dylife. (CWO)
Ferroan dolomite is a nebulous term that is applied to dolomite that has an iron content. Dylife mine,
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Ferroan dolomite. Central Wales.
Ferroan dolomite is a way of describing dolomite which has an iron content, which imparts a rusty brown colour.
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Flint.
Flint, sometimes referred to as chert by geologists, is a cryptocrystalline form of quartz, SiO2
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Fluorite, Alston moor.
Fluorite, CaF2 , also called fluorspar is calcium fluoride. The specimen is from Smallcleugh mine, Alston moor,
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Fluorite, Weardale.
Fluorite, CaF2, is also known as fluorspar. This calcium fluoride mineral belongs to the halide family,
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Fluorite. Egremont.
Fluorite is calcium fluoride, CaF2 It may be called fluorspar, and is a halide mineral.
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Fluorite. Mina Moscona Solis, Spain.
Fluorite, CaF2 is calcium fluoride and is a halide mineral. In it's pure state it is colourless,
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Fuchsite (Chrome mica)
Fuchsite, also referred to as chrome mica has the chemical formula KAl2(Si3Al)O10(OH)2
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Fulgarite, Silica var.
This specimen is a fulgarite, which has been created by the action of lightning.
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Galena and Quartz, Nantiera. (CWO)
Galena, PbS, and Quartz, SiO2. Nantiera mine, Central Wales Orefield.
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Galena on Quartz, Dylife. (CWO)
Galena, PbS, and Quartz, SiO2. Dylife mine, Nr. Staylittle, Central Wales Orefield.
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Galena with quartz, Aberdaunant. (CWO)
Galena, PbS, and Quartz, SiO2. Aberdaunant mine, Nr. Llanidloes, Central Wales Orefield.
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Galena, Eaglebrook. (CWO)
Galena, PbS, Lead sulphide. Eaglebrook ( Nantycagl ) mine, Nant-y-moch reservoir west Wales.
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Galena, Eyam.
Galena, lead sulfide, PbS The irregular boundary of the galena is probably because
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Galena, Pen Dylife. (CWO)
Galena, PbS. Pen Dylife mine, Nr Staylittle, west Wales. Thin deposits
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Galena, Pen y Gaer hill, Llanidloes. (CWO)
Galena, Lead sulphide, PbS. Pen y Gaer hill, Llanidloes,
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Garnet with Muscovite mica, Evje.
The two main components of this specimen are almandine garnet, and muscovite mica.
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Goethite on Pyrite, Aberdaunant. (CWO)
Goethite, Iron oxyhydroxide, FeO(OH). and Pyrite, FeS2 Aberdaunant mine, Central Wales Orefield.
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Goethite, Aberdaunant. (CWO)
Goethite, FeO(OH). Aberdaunant mine, Central Wales Orefield. Two, very thin deposits of goethite
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Goethite, Aberdaunant. (CWO)
Goethite, Iron oxyhydroxide, FeO(OH). and Pyrite, FeS2 Aberdaunant mine, Central Wales Orefield.
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Goethite, Ton Mawr.
Goethite is an iron bearing hydroxide mineral. a- FeO ( OH ). This specimen has a vugh of acicular goethite
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Goethite. Cornwall.
Goethite is hydrated iron oxide, (FeO(OH)). It is often formed from the breakdown of other iron minerals,
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Goethite/Haematite, Merehead quarry.
Goethite, a-FeO(OH) and haematite, Fe2O3 are both iron minerals, and are quite difficult to identify from colour alone,
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Grossular ( garnet ), Grova.
Grossular, Ca3Al2(SiO4)3 is a calcium-aluminium species of the garnet group.
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Gypsum, Lubin,Poland.
Gypsum, Calcium sulphate dihydrate, CaSO4 . 2H2O is an evaporite mineral. The variety of this specimen is known as selenite,
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Gypsum, S.Australia.
Gypsum, Calcium sulphate dihydrate, CaSO4 . 2H2O As described in other gypsum references,
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Gypsum, altered.
Gypsum (CaSO4.2H2O) calcium sulfate dihydrate is an evaporite mineral which can ocurr in many different colours, and crystal habits.
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Gypsum, Blue anchor bay.
Gypsum is an evaporite mineral with the formula CaSO4 . 2H2O , calcium sulphate dihydrate.
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Gypsum, Crete.
Gypsum, CaSO4 . 2H2O calcium sulphate dihydrate, is an evaporite mineral.
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Gypsum, Desert rose var.
Gypsum, CaSO. 4· 2H2O is an evaporite mineral. It is precipitated from mineral rich bodies of water,
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Gypsum, Desert rose, Morocco.
Gypsum is calcium sulphate dihydrate, CaSO4 . 2H2O This variety of rosette crystal habit is commonly referred to as a "desert rose".
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Gypsum, Nottingham.
Gypsum, CaSO4 . 2H2O is an evaporite mineral, commonly found in layered sedimentary rocks.
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Gypsum, satin spar var.
Gypsum, CaSO4 . 2H2O Calcium sulfate dihydrate. is an evaporate mineral
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Gypsum, satin spar var. Penarth.
Gypsum, CaSO4 . 2H2O Calcium sulphate dihydrate, is an evaporite mineral,
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Gypsum, sedimentary, Penarth.
These specimens of gypsum, CaSO4 . 2H2O were collected on the same day. Both had eroded from the cliff face on Penarth beach,
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Gypsum, selenite var. South Australia.
Gypsum, CaSO4 . 2H2O is an evaporite mineral. This selenite variety specimen
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Gypsum, selenite var. Essone France
Gypsum, calcium sulfate dihydrate, CaSO4 . 2H2O This specimen from Essone in France is referred to as selenite.
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Haematite, Aberdaunant. (CWO)
Haematite(Hematite),Iron oxide, FeO2. Aberdaunant mine, Central Wales Orefield.
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Haematite, Bamfylde mine.
Haematite, Fe2O3, Iron oxide, This specimen, because of it's silvery appearance,
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Haematite, Dylife. (CWO)
Haematite(Hematite), Iron oxide, Fe2O3, Dylife mine, Nr. Staylittle, Central Wales Orefield.
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Haematite, Frizington.
Haematite is an iron oxide, Fe2O3 This specimen is botryoidal in habit,
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Haematite, Marine colliery.
Haematite nodule, Fe2O3 iron oxide. with siderite and quartz.
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Haematite, Marine colliery.
Hematite, Fe2O3 iron oxide, with siderite, FeCO3 iron carbonate. The haematite in this specimen is in the form
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Haematite, Ton Mawr quarry.
Hematite, Fe2O3 is iron oxide, and the main ore of iron. The location of this specimen is Ton Mawr quarry, Taffs Well,
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Haematite,Forest of Dean
Haematite, Fe2O3, iron oxide, and the main ore of iron. These specimens were collected from Mine Train quarry
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Halite, Rock salt. Cheshire.
Halite, or rock salt is sodium chloride (NaCl).This is an evaporite mineral
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Hematite. Kidney ore var. Morocco.
Hematite, Iron oxide, Fe2O3 is the most important ore of iron.
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Hemimorphite 1, Henfwlch. (CWO)
Hemimorphite, Zn4(SiO7)(OH2).H2O. Henfwlch mine, west Wales. The beauty of the hemimorphite
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Hemimorphite 2, Henfwlch. (CWO)
Hemimorphite, Zn4(Si2O7(OH)2.H2), Henfwlch mine, West Wales.
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Hemimorphite.
Hemimorphite is a sorosilicate mineral with the formula Zn4Si2O7(OH)2-H2O
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Hydraulic brecciation, Bryn y Rafr. (CWO)
Bryn y Rafr mine, West Wales. Typical brecciated material from this site,
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Hydraulic brecciation, Cafartha, Staylittle. (CWO)
Cafartha mine, Staylittle, Central Wales Orefield. This pretty little specimen is a mix of
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Hydraulic brecciation, Castell mine. (CWO)
Castell mine, west Wales. This fine example of hydraulic brecciation is made up of host rock, quartz, and
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Hydrothermal Breccia.
This specimen of breccia is from Henfwlch mine, Nant y Moch reservoir,
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Hydrozincite, Pencurig mine. (CWO)
Hydrozincite, Zinc bloom, Marionite, Zn5(CO3)2(OH)6. Pencurig mine, Dylife, Central Wales Orefield.
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Inesite, Kuruman, S. Africa.
Inesite, is a complex inosilicate mineral, with a formula Ca2(Mn,Fe)7Si10O28(OH)2 · 5H2O
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Jasper, Leopardskin Variety. Spain.
Jasper, SiO2, Silicon dioxide. is an aggregate of chalcedony and microgranular quartz,
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Jasper, Mookaite var.
Mookaite is a local name attributed to this jasper, SiO2. It is so named because it is from
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Jasper, Mookaite var. Mooka station.
Jasper, Mookaite var. SiO2 , is not a mineral as such, but is a rock. It is formed as a sedimentary rock
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Jasper, Tiger iron var.
Tiger iron jasper is a gemstone variety of jasper. It is a member of the quartz group, SiO2
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Jet ( Whitby Jet ).
Jet is not a mineral. It does not have a crystalline structure,
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Labradorite, Larvic,Norway.
Labradorite, ((Ca,Na)(Al,Si)4O8 is a feldspar mineral and is an intermediate to calcic member of the plagioclase feldspar series.
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Lepidolite. Brazil.
Lepidolite, Na(AlSi3O8). Simplified formula, is a member of the mica family.
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Limestone,Landscape marble, Cotham.
Limestone, carbonate rock, Cotham marble var. This is a specimen that should not be in my mineral collection. I
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Linarite and Malachite, Geufron. (CWO)
Linarite,copper lead sulphide, PbCuSO4(OH)2 and Malachite, copper carbonate, Cu2CO3(OH)2.
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Magnesite (Citron chrysoprase). Australia.
Magnesite, MgCO3, is a magnesium carbonate. The marketing name of citron chrysoprase
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Malachite with Chrysocolla.
Malachite is a copper carbonate hydroxide with a formula of Cu2CO3(OH)2.
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Malachite, Katanga prov. Congo.
Malachite is a copper carbonate mineral with the formula Cu2CO3(OH)2 and is formed from the weathering
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Malachite, Brazil.
Malachite is a copper carbonate mineral with the formula Cu2CO3(OH)2
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Malachite. Shaba province, Congo.
Malachite is a copper carbonate mineral, Cu2CO3(OH)2 which forms as the result of weathering
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Manganese ore. South Africa.
Manganese ore can be quite complex in composition, however the known location and origin
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Manganese oxide, Llanymynech.
Manganese oxide, MnO2, dendritic variety. The specimen was collected from
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Marcasite / Quartz, Bryn y Rafr. (CWO)
Marcasite, FeS2, and Quartz, SiO2, Bryn y Rafr mine, west Wales. This brecciated rock
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Marcasite / Quartz, Bryn y Rafr. (CWO)
Marcasite,FeS2, and Quartz,SiO2. Bryn y Rafr mine, west Wales.
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Marcasite and Quartz, Bryn y Rafra. (CWO)
Marcasite FeS2, and Quartz, SiO2. Bryn y Rafr mine, west Wales.
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Marcasite, Bry y Rafr. (CWO)
Marcaste, FeS2. Bryn y Rafr mine, West Wales. Two halves of a broken specimen.
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Marcasite, Quartz, breccia.
This specimen is from Bryn y Rafr mine, on the shore of Nant y Moch reservoir, west Wales.
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Marcasite/Quartz, Bryn y Rafr. (CWO)
Marcasite, FeS2, and Quartz, SiO2. Bryn y Rafr mine, west Wales.
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Microcline, Argentina.
Microcline feldspar has the formula of KAlSi3O8, and is sometimes referred to as
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Millerite, Marine colliery.
Millerite is nickel sulphide, NiS. The specimen is from waste heaps at Marine colliery,
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Mineral assemblage on host rock, Aberdaunant. (CWO)
Aberdaunant mine, Central Wales Orefield. A deposition of different minerals on two faces of host rock.
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Molybdenite.
Molebdynite is molybdenum disulfide, MoS2 It was at one time thought to be lead,
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Muscovite. Liskeard.
Muscovite is the most common form of mica. It is known as insinglass, potash mica,
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Natrolite.
Natrolite is a tectosilicate mineral, in the zeolite group. It is a hydrated sodium and aluminium silicate
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Obsidian (Apache tear), Superior, Colorado.
Obsidian is a volcanic glass classed as a mineraloid, and is composed of approximately 70 % Silica, SiO2,
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Obsidian. Mexico.
Very often referred to as "volcanic glass" Obsidian is neither a rock or a mineral.
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Okenite, Origin unknown.
Okenite, CaSi2O . 5 . 2H2O ( simplistic formula ) is a silicate mineral often found together with zeolites
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Okenite, Poona,India.
Okenite, CaSi2O . 5 . 2H2O ( simplistic formula ) is a silicate mineral often found together with zeolites
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Opal, Andamooka.
Opal, SiO2 . nH2O is a hydrated amorphous form of silica,
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Opal, Madagascar.
Opal, SiO2 . nH2O is not a mineral, because it has a water content, and so it is classed as a mineraloid,
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Opal, Norsman opal mine,Australia.
Opal, common Opal. SiO2 . nH2O. Opal is a hydrated amorphous form of silica,
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Orbicular Rhyolite. Chihuahua,Mexico.
In highly silicified deposits of rhyolitic tuff, quartz and feldspar crystallise in a manner
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Petrified wood.
This specimen of petrified wood, more commonly called fossil wood, or wood opal. is made of almost pure silica,
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Picrolite, serpentine var.
Picrolite is a sepentine mineral. It is a variety of antigorite,
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Prehnite, after laumonite.
Prehnite is an inosilicate of calcium and aluminium with the formula Ca2AlSi3O12(OH)
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Prehnite, Loanhead quarry.
Prehnite is an inosilicate with the formula Ca2Al(AlSi3O10)(OH)2
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Pyrite on Dolomite, Tan y Foel quarry.
Pyrite, FeS2, and Dolomite, CaMg(CO3)2. Tan y Foel quarry, Nr Adfa. central Wales.
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Pyrite, Navajun,Spain.
This beautiful crystal of pyrite, FeS2 is from a locality renowned for an abundance of such specimens.
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Pyrite, Unknown origin.
Pyrite, FeS2 an iron sulphide, is the most common sulphide mineral.
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Pyrite. Venezuela.
Pyrite, FeS2, Iron sulphide. There is not a lot to say about this familiar mineral,
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Pyromorphite, Aberdaunant. (CWO)
Pyromorphite, a secondary mineral of lead, Pb5(PO4)5CL. Aberdaunant mine, Central Wales Orefield.
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Pyromorphite, Aberdaunant. (CWO)
Pyromorphite, a secondary mineral of lead, Bb5(PO4)3Cl. Aberdaunant mine, Central Wales Orefield.
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Pyromorphite, Caldbeck.
Pyromorphite, Pb5(PO4)3Cl is lead chloride phosphate. One of the secondary lead minerals
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Pyromorphite, Driggeth.
Pyromorphite, Pb5(PO4)3Cl is lead chloride phosphate, a secondary lead mineral
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Pyromorphite,Bwlch Glas.
Pyromorphite, Pb5(PO4)3Cl. Bwlch Glas mine, Nr. Talybont, West Wales.
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Pyromorphite. Cumbria.
Pyromorphite, Pb5(PO4)3Cl is a secondary mineral of lead sulphide, Pb5
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Pyrophyllite, California.
Pyrophyllite is a phyllosilicate mineral, Al2Si4O10(OH)2 Aluminium silicate hydroxide.
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Quartz (Milky),Ystrad Meurig.
Quartx, SiO2, Ystrad Meurig quarry, Ysbyty Ystwyth, West Wales.
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Quartz ( Druzy ), Bryn y Rafr. (CWO)
Quartz, SiO2. Bryn y Rafr mine, Central Wales Orefield. A specimen composed of druzy quartz,
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Quartz ( Eisenkiesel var. ). Pendeen.
Eisenkiesel is a German term which translates to iron quartz, or ferruginous quartz.
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Quartz ( var. floater ). Huanuco,Peru.
These crystals of quartz, SiO2 are in a formation known as floaters,
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Quartz (druzy) and Calcite 1,Dylife. (CWO)
Quartz, SiO2, and Calcite, CaCO3. Dylife mine, Central Wales Orefield. Clear druzy quartz crystals
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Quartz (druzy) and Calcite 2 (CWO)
Dylife mine, Central Wales Orefield. Detail from druzy quartz and calcite 1.
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Quartz (Druzy), Van mine. (CWO)
Druzy quartz, SiO2. Van mine, Central Wales Orefield. Clusters of small,
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Quartz crystals,Llawr Y Glyn.
Quartz, SiO2. Llawr y Glyn, Nr. Staylittle, central Wales. This unremarkable specimen
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Quartz crystals,Van mine. (CWO)
Quartz, SiO2. Van mine, Central Wales Orefield. These specimens were picked up many years ago,
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Quartz geode.
Quartz, silicon dioxide, SiO2 is the most abundant mineral in the earth's surface.
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Quartz in brecciated rock, Bryn y Rafr. (CWO)
Quartz, SiO2. Bryn Y Rafr mine, west Wales. Common in hydrothermal ore deposits,
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Quartz miscellaneous, Bryn y Rafr. (CWO)
Quartz, SiO2. Bryn y Rafr mine, west Wales. The two smaller specimens are skeletal in appearance,
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Quartz var. Falcons eye. New zealand.
Falcons eye quartz is a blue variety of Tigers eye quartz.
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Quartz var. Tigers eye. New zealand
Tigers eye variety of quartz, SiO2 is formed from by the parallel intergrowth of quartz
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Quartz, ( Druzy), Eaglebrook.
Quartz, SiO2, Eaglebrook mine, west Wales. A fine example of druzy quartz.
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Quartz, (Druzy), Bryn y Rafr. (CWO)
Quartz, SiO2. Bryn y Rafr mine, Central Wales Orefield. A specimen composed of druzy quartz,
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Quartz, Aberdaunant. (CWO)
Quartz, SiO2. Aberdaunant mine, Nr. Llanidloes, Central Wales Orefield.
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Quartz, Amethyst var.
Quartz, silicon dioxide, SiO2 has many varieties, dependent on conditions in which it is formed,
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Quartz, Amethyst var.
This specimen of amethyst var. quartz, SiO2 is very unremarkable in appearance,
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Quartz, Bryn Y Rafr. (CWO)
Quartz, SiO2. Bryn y Rafr mine, west Wales. The two smaller specimens are skeletal in appearance,
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Quartz, Cwn Fron. (CWO)
Quartz, SiO2. Cwm Fron mine, Nr. Tylwych, central Wales.
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Quartz, Dylife. (CWO)
Quartz, SiO2, Dyife mine Nr Staylittle,Central Wales Orefield.
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Quartz, Haematitic variety, Bryn y Rafr. (CWO)
Quartz, SiO2. Bryn y Rafr mine, west Wales. Very small druzy crystals
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Quartz, Haematitic, Aberdaunant. (CWO)
Quartz, SiO2, Aberdaunant mine, Central Wales orefield. Small prismatic crystals in druzy form,
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Quartz, Haematitic, Dyfyngwm. (CWO)
Quatrtz, SiO2, Dyfyngwm mine, Nr.Staylittle,Central Wales. Brecciated rock
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Quartz, Herkimer diamond ( type ), Marine colliery.
Herkimer diamonds are small doubly terminated quartz crystals. SiO2 and are so named
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Quartz, Net veining, Bryn y Rafr. (CWO)
Quartz, SiO2. Bryn y Rafr mine, west Wales. An example of net veining on a small scale.
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Quartz, Rose var.
Quartz is silicon dioxide SiO2, one of the most common minerals to be found in the Earths crust. There are many varieties of quartz, ....
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Quartz, smoky var. Origin unknown.
Smoky quartz SiO2. silicon dioxide, is quartz which has attained a darkening in colour
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Quartz, stressed. Llandinam, Powys.
These specimens of quartz, SiO2 were collected on the top of one of the highest hills in my locality.
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Quartz, Tan y Foel.
There are many badly formed prismatic crystals of quartz, SiO2 lining this cavity in sandstone.
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Quartz,(Druzy), Bryn Y Rafr. (CWO)
Quartz,SiO2. Bryn y Rafr mine, west Wales. There is nothing unusual or spectacular about this specimen.
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Quartz,(Druzy), Cafartha mine. (CWO)
Quartz, SiO2. Cafartha mine, Nr. Staylittle, Central Wales Orefield. This specimen, though small,
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Rhodochrosite, Australia.
Rhodochrosite is Manganese carbonate MnCO3. This specimen is the product of brecciation,
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Rhodochrosite. Broken Hill,Australia.
Rhodochrosite, MnCO3 is a manganese carbonate mineral, sometimes called mangano calcite.
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Rutile, Australia.
Rutile is titanium oxide, TiO2 It is a common accessory mineral in high-temperature and
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Rutile, Mt. Painter, Australia.
Rutile, TiO2 is titanium dioxide, and trimorphous with anatase, and brookite.
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Rutile. New zealand.
Rutile TiO2 is titanium oxide. The occurrence of rutile crystals enclosed in quartz is not uncommon.
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Sapphirine/Anthophyllite
The specimen is composed of two minerals, sapphirine and anthophyllite.
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Schorl tourmaline, Norway.
The general formula for tourmaline, which is a group mineral is NaFe2+3Al6(BO3)3Si6O18(OH)4
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Schorl tourmaline, Brazil.
Tourmaline is a crystalline boron silicate mineral, with 33 different minerals in the group. The most common mineral is schorl,
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Selenite ( Desert rose var. ). Chihuahua.
Selenite, Desert rose var. is one of the four crystal structures of gypsum, with the formula of CaSO4 . 2H2O, calcium sulfate dihydrate.
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Serpentine, Cornwall.
Serpentinite is a metamorphic rock which contains one or more of the serpentine group minerals.
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Siderite 1, Castell mine.
Siderite, Iron carbonate, FeCO3. Castell mine, West Wales. A concretionary mass of small rhomohedral crystals.
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Siderite 2, Castell mine.
Siderite, iron carbonate, FeCO3. Castell mine, West Wales. A small vugh of rhombohedral siderite crystals
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Siderite, Lipez, Bolivia
Siderite, FeCO3 is an iron carbonate. It has an iron content
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Siderite, Abernaunant. (CWO)
Siderite, Iron carbonate, FeCO3. Aberdaunant mine, Nr. Llanidloes, Central Wales Orefield.
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Siderite, Cafartha mine. (CWO)
Siderite, Iron carbonate, FeCO3. Cafartha mine, Nr Staylittle, Central Wales Orefield.
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Siderite, Geufron. (CWO)
Siderite, Iron carbonate, FeCO3. This mineral is fairly common throughout the Central Wales orefield.
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Siderite, Marine colliery.
Siderite is Iron carbonate FeCO3 This specimen was collected from Marine colliery waste heaps in Ebbw Vale
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Siderite, Marine colliery.
Siderite is an iron carbonate. FeCO3 This specimen was collected from a waste heap on the site of the closed Marine colliery
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Siderite, Siglenlas mine. (CWO)
Siderite, Iron cabonate, FeCO3. Siglenlas mine, Nr. Llanidloes, Central Wales Orefield.
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Siderite, Van mine. (CWO)
Siderite, Iron carbonate, FeCO3. Van mine, Nr. Llanidloes, Central Wales Orefield.
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Siderite, Ystrad Meurig.
Siderite, Iron carbonate, FeCO3. Ystrad Meurig quarry, Ysbyty Ystwyth, west Wales.
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Sodalite, New zealand.
Sodalite is named because of it's soda content. It is a tectosilicate mineral with the formula Na8 ( Al6 Si6 O24 ) Cl2
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Specular Hematite with Fluorite, Egremont.
Both minerals on this specimen are interesting, The specular variety of hematite , Fe2O3 is often referred to by the name specularite.
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Sphalerite / Quartz, Bryn y Rafr. (CWO)
Sphalerite, ZnS, and Quartz, SiO2. Bryn y Rafr mine, west Wales. Several layers of sphalerite separated by quartz.
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Sphalerite and Siderite, Castell mine. (CWO)
Sphalerite, (Zn,Fe)S. and Siderite, FeCO3. Castell mine, west Wales. The bulk of the specimen is massive siderite
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Sphalerite, Cwmbryno.
Sphalerite, Zinc sulphide, (Zn,Fe)S. Cwmbryno mine, west Wales. Sphalerite in brecciated rock.
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Sphalerite, Driggeth, Cumbria.
Sphalerite, zinc sulfide,( Zn,Fe)S from the Driggeth mine in Cumbria, is the most common ore of zinc
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Sphalerite, Driggeth.
Sphalerite, (Zn,Fe)S, Zinc sulphide, is the main ore of zinc, and is usually associated with galena.
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Sphalerite, Dylife mine. (CWO)
Sphalerite, Zinc sulphide, (Zn,Fe)S. Dylife mine, Central Wales Orefield. Brecciated rock from ore deposits,
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Sphalerite, Dylife. (CWO)
Sphalerite, Zinc sulphide, ZnS, Dylife mine,Central Wales Orefield. The sphalerite is massive,
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Sphalerite, Dylife. (CWO)
Sphalerite, Zinc sulphide, (Zn,Fe)S. Dylife mine, Central Wales Orefield. Sphalerite in massive form with apparent alignment features.
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Sphalerite, Galena and Calcite 1, Nantiago. (CWO)
Nantiago mine, Central Wales Orefield. Sphalerite and galena filling crevices in fractured calcite.
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Sphalerite, Galena and Calcite 2, Nantiago. (CWO)
Nantiago mine, Central Wales Orefield. This is a detail from sphalerite, galena, and calcite 1.
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Sphalerite, Nentsberry Haggs.
Sphalerite. ( Zn,Fe ) S ), Zinc sulphide, with variable iron content. Sphalerite is the main ore of zinc, and sometimes referred to by miners as zinc blende,
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Sphalerite, Origin unknown.
Sphalerite is ZnS, Zinc sulphide, a major ore of zinc. The specimens location is unknown,
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Sphalerite, Snailbeach.
Sphalerite, (Zn, Fe)S, sometimes called "Black jack" or "Blende", is zinc sulphide, and is the main ore of zinc.
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Sphalerite, Snailbeach.
Sphalerite, (Zn, Fe)S, sometimes called "Black jack" or "Blende", is zinc sulphide, and is the main ore of zinc.
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Spodumene, Kunzite var., Origin unknown.
Spodumene ( Kunzite var. ) LiAl(SiO3)2 is a pyroxene mineral, lithium aluminium inosilicate.
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Stauralite, Russia.
Stauralite, Fe2+2Al9O6(SiO4)4(O,OH)2 is a regional metamorphic neosilicate mineral.
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Stilbite with Actinolite, Mt.Painter.
The main component of this specimen is stilbite, ( the orangey mineral ) with some actinolite, ( the dark mineral ) and a minor amount of laumantite.
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Stilbite. Isle of Skye.
Stilbite is a tectosilicate mineral of the zeolite group, and is a series name rather than a specific mineral.
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Sulphur. ( Sulfur ), Sicily.
Sulphur, S,is a native element that is abundant in the seas and in the Earths crust and even in the human body.
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Tourmaline, Colcerrow quarry.
Tourmaline is a crystalline boron silicate mineral. There are several varieties and colours.
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Tourmaline, Cornwall.
Tourmaline is a crystalline boron silicate mineral. The specimen is composed of black tourmaline
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Tourmaline, rossmanite var.
Tourmaline is a boron silicate mineral, which occurs as an accessory mineral in igneous and metamorphic rocks.
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Tourmaline, schorl var.
Tourmaline is a crystalline boron silicate mineral, Na(Li,Al,Mg,Mn,Fe)3Al6(BO3)3 Si6O18(OH)4
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Vanadinite, Morocco.
Vanadinite belongs to the apatite group 0f phosphates, and has the formula of Pb5(VO4)3Cl.
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Vanadinite, Arizona.
Vanadinite is Pb5(VO4)3Cl, Lead chloro vanadate. belonging to the apatite group of phosphates.
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Vanadinite. Unknown origin.
Vanadinite Pb5(VO4)3Cl is a mineral which forms in the oxidation zones of lead deposits,
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Vermiculite. Ontario.
Vermiculite is a hydrous phylosilicate mineral, (Mg,Fe2+, Fe3+ )3(Al,Si)4O10 (OH)2 . 4H2O
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Vivianite, Ukraine.
Vivianite, Fe2+3(PO4)2 .8H2O is a hydrated iron phosphate mineral.
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Witherite, Gorn mine. (CWO)
Witherite, Barium carbonate, BaCO3. Gorn mine, Nr. Llanidloes, Central Wales Orefield.
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Woodwardite, Ireland
Woodwardite is a rare Hydrated Copper Sulfate found in weathered deposits at copper mines.
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Wulfenite, Origin unknown.
Wulfenite is a secondary mineral of lead and is a lead molybdate with the formula of PbMoO4
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Quartz,Unclassified,Pencurig mine (CWO)
Quartz, SiO2. Pencurig mine, Dylife, Central Wales Orefield. These specimens were taken from the wall of an adit.
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