[kahy-uh-nahyt] /ˈkaɪ əˌnaɪt/

a mineral, aluminum silicate, Al 2 SiO 5 , occurring in blue or greenish bladed triclinic crystals, used as a refractory.
a grey, green, or blue mineral consisting of aluminium silicate in triclinic crystalline form. It occurs in metamorphic rocks and is used as a refractory. Formula AL2SiO5
A bluish-green to colorless triclinic mineral. Kyanite occurs as long, thin, blade-shaped crystals in metamorphic rocks. It is unique among minerals in having two grades of hardness, one along its length, and one along its width. It is a polymorph of andalusite and sillimanite, but can form at lower temperatures than either of these. Chemical formula: Al2SiO5.

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