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Kyanite

Kyanite is an aluminium silicate mineral with an unusual hardness quality. Its crystal system is triclinic, it forms elongated, flat, blade like crystals. The most popular colours for metaphysical use are blue, indigo, green, and black, but Kyanite can also be white, pink, yellow or grey. It occurs in Brazil, South Africa, Switzerland, Burma, Kenya, Mexico and the USA.