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Russian Gemstones Encyclopedia

Vladimir Bukanov. Russian Gemstones Encyclopedia

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SOGDIANITE


SOGDIANITE (Sogdianit—Sogdianite——огдианит) (Dusmatov, V.D. et al., 1968), after its discovery location in Sogdiana, the ancient name of the discovery region in Central Asia. Syn. – sogdianovite. Silicate – K[12])2[9](Zr,Ti,Fe,Al)2[6]Li3[4][Si12O30], subclass rings silicate, hexagonal system. Hardness 5-6. Density 2.8-2.9. Glass luster. Cleavage in one direction. Sogdianite is a rare mineral, which is found in the form of violet and violet-pink lamellar crystals up to 10x7x4 cm. in size and their grained aggregates. Translucent to non-transparent. In massive aggregates, it looks like charoite and sugilite. Sogdianite in grains up to 10x7x4 cm. was discovered in Tadzhikistan, in the Dara-i-Pioz massif, Alai Mts., 35 km. to the north-east from Tadzhikabad in 1964. In South Africa, it is mined together with sugilite at the Hotazel mine, Kalahari, Northern Cape Prov. Recently it was discovered in the U.S.A., in the Washington State, near Washington Pass, Okanogan Co. It is cut in cabochons, which are highly evaluated because of their rarity and beautiful color.

Synthesis. There are data on receiving of synthetic sogdianite.

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