Minerals / Calcite, Creigiau quarry.

Calcite, calcium carbonate, CaCO3.  Two more specimens of calcite from Creigiau quarry, South Wales. These and all other specimens in my collection were collected at one visit. The main picture is a cluster of several untidy twinned crystals. and in small pockets between them are small groups of small single bladed crystals with the appearance of flattened " rhombs ". The inset picture shows a single crystal which is not on the same scale, but which has been reduced in size to fit this illustration.    

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