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Measurements: 55 x 49 x 46 mm Description: A few gemmy dioptase crystals (the largest 5 mm long) on a chunk of quartz. Chemical Composition: Cu2+SiO2(OH)2 (dioptase) SiO2 (quartz) Hardness on Mohs Scale: (dioptase) 5 (quartz) 7 Location: Kaokoland, Northern Namibia. Specimen Code: NKO 011 US $ 35
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