Cluster of large emerald-green DIOPTASE crystals on matrix. The two largest dioptase crystals are 0.9 inches long. Luster is vitreous. Crystals are rhombohedral shape. The specimen is from the Kaokoveld plateau in Namibia.
DIOPTASE is a copper silicate mineral. Color is an intense emerald-green to bluish-green copper silicate mineral. It’s luster is vitreous to sub-adamantine. It has a hardness of 5, the same as apatite. Its specific gravity is 3.28–3.35, and it has two perfect and one very good cleavage directions. Crystal Class is Hexagonal Rhombohedral (Trigonal), forming 6-sided crystals that are terminated by rhombohedra.
Location: Kaokoveld Plateau, Kunene Region, Namibia
Specimen Size: 2.2 x 1.9 x 1.3 inches
Specimen Weight: 105 grams (3.7 ounces)
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