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MD-219260
Chalcomenite
El Dragon mine, Antonio Quijarro Province, Potosi Department, Bolivia
Thumbnail, 1.8 x 1.3 x 1.3 cm
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A specimen of chalcomenite, a rare by-product of oxidation of primary copper minerals. It is only ever seen in fairly tiny crystals. At this locality, it results from the oxidation of krutaite.