Minerals / Calcite ( precipitated ), Ystrad Meurig.

Calcite,  CaCO3  Calcium carbonate in precipitated form. A little bit of a novelty in my collection, this specimen was first collected in liquid form, oozing out of the quarry face at Ystrad Meurig in Ceredigion.  After a few months the specimen hardened as the liquid dried out, leaving calcite in an irregular form. That was back in 2005, and ever since it has hardened even more. 

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