Category:Native copper in calcite crystals

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Native copper in calcite crystals (Mesoproterozoic mineralization age; Central Mine, Keweenaw Peninsula, Michigan)‎ (6 F)

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Native copper in calcite crystal (late Mesoproterozoic mineralization age, 1.05-1.06 Ga; Central Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 3 - 41748137370.jpg 1,929 × 2,631; 3.86 MB

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