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Tanzanite

Tanzanite is the transparent blue variety of zoisite, a hydrous calcium aluminium silicate mineral. It was discovered in 1967 in Tanzania, East Africa, which remains the only known mining location. Colours range mainly from a sapphire blue to a violet blue and it is commonly heat treated to enhance colour. A rare and extremely popular stone. Birthstone for December. Hardness: 6.5 (Mohs).

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