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Calcite on Dioptase, Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia

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    Dioptase, Omaue Mine, Kaokoveld Plateau, Kunene Region, Namibia Measures: 9.5 cm tall x 9.9 cm wide Dioptase, once believed to be emerald when first encountered, is amongst the most vividly colored species. Large gem...
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  • Benitoite on Natrolite, California State Gem Mine, California
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