Bill Bagley Minerals

Bill Bagley Rocks and Minerals

Minerals / Calcite, twinned scalenahedral crystals, Creigau quarry.

Calcite, calcuium carbonate, CaCO3. Creigau quarry, near Cardiff, south Wales. A collection of twinned scalenahedral crystals of calcite interspersed with much smaller nail head crystals. All the crystals have acquired a coating of a reddy brown colour, probably with an iron content. Close to where this specimen was collected was a five foot cavity in the quarry wall, completely lined with even larger crystals, but impossible to recover without catastrophic damage. 

Calcite, twinned scalenahedral crystals, Creigau quarry. Bill Bagley Rocks and Minerals



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