Minerals / 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. This specimen, which was collected from Blaengwynlais quarry, near Cardiff,  is a vhug of scalenahedral and rhombic crystals with step faces set in  reddish limestone.

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