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Kyanite

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Kianite - mineral, aluminum silicate synonyms - disthene . Often found in crystals. The color of this mineral is blue, green, yellow, violet, colorless and almost black. The color is caused by impurities of compounds of titanium, chromium, iron or manganese. The color may vary depending on the viewing angle. There are kyanites with a "cat's eye" effect, which are usually cabochon cut. In nature, opaque tangled-fibrous kyanite is more common. Kyanite is a refractory material, at 1100 ° C it decomposes into quartz glass and mullite. The hardness of kyanite sharply differs in directions: along the crystal - 4.4 (scratched with a knife), transverse - 7.

Gemstone kyanite deposits exist in many parts of the world: in Burma , Brazil, Kenya, USA , Switzerland , Austria, Germany. Indian kyanites are known. In Russia, cutting stones were mined in the Urals and also in Karelia , on the Kola Peninsula.

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