Calcite.

Calcite.

Calcite, Calcium carbonate,  CaCO3 This specimen is one of many collected from Taffs Well quarry, Cardiff , South Wales. There are several varieties of crystal to be found at this quarry. In this specimen the crystals are stubby and prismatic, with a pale cream colouration. The crystals have quite obvious horizontal striations, and are growing from a base of massive calcite.