From Butte Mining District, Summit Valley, Silver Bow County, Montana USA Foliated crystalline mass of Covellite with iridescent sheen ranging from...
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From Butte Mining District, Summit Valley, Silver Bow County, Montana USA Foliated crystalline mass of Covellite with iridescent sheen ranging from...
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From Bou Beker Mine, 21 km SSE of Oujda, Errachidia Province, Morocco An aesthetic specimen of flat disc shaped concretions of bright royal blue az...
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