DIOPTASE in CALCITE, Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia DIOPTASE in CALCITE, Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia. This specimen is one of the most richly included with dioptase in sharp rhombohedral calcite that I have ever owned. The largest calcite at middle-left measures one inch! Measures, as it stands, unassisted, 5-3/4x4-1/4x1-3/4 inches. The maximum dimension is 7 inches. Price $4,500.
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Lawrence H. Conklin
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