Minerals / Calcite, two specimens, Nantiago. (CWO)

Calcite, Calcium carbonate, CaCO3. Nantiago mine, Central Wales Orefield.  Two specimens. The first has interleaved flattened scalenahedral crystals with weathered surfaces. The second is mainly composed of massive calcite adjoining a layer of sphalerite, in which is embedded a fractured rhombohedral calcite crystal with a prominent growth line.

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