Minerals / Quartz ( Eisenkiesel var. ). Pendeen.

Eisenkiesel is a German term which translates to iron quartz, or ferruginous quartz. In this specimen the pyramidal crystals of quartz are step faced, with a dark grey/brown colour, and are partially covered with "paper calcite" crystals. The specimen is from the coronation lode of the Geevor mine, at Pendeen in Cornwall.  

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