Minerals / Calcite cleavage planes, Tankerville.

Calcite, calcium carbonate,  CaCO3   Although of little interest, this specimen is included in the collection, simply because it was collected in my very early collecting days. It was collected from a spoil heap at Tankerville mine, in the Shelve area of Shropshire,  The calcite is just off white, and is plentiful at this site.

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