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Metacinnabar

Locality: Mount Diablo Mine (Mt. Diablo Mine; Diablo Mine; Ryne Mine), Mount Diablo (Mt Diablo), Mount Diablo State Park, Clayton, Diablo Range, Contra Costa Co., California, USA

Metacinnabar in penetration-twinned pyritohedrons. This kind of twin is called an “iron cross” when occurring in pyrite. Crystal 0.7 mm. Collection and photograph Norman King.

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Photo added: 21st Oct 2010

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