Minerals / Calcite. Ton Mawr quarry.

Calcite, calcium carbonate, CaCO3  This specimen was collected from Ton Mawr limestone quarry, near Cardiff, South Wales. The fractured surface of the limestone has a distinct purple tint. There are about twenty of white nail-head crystals of calcite resting on a surface covered with minute rust coloured calcite crystals, many of which are rhombohedral.   

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