a mineral, aluminum silicate, Al2SiO5, occurring in blue or greenish bladed triclinic crystals, used as a refractory.
Origin of kyanite
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In mica-gneisses sillimanite, kyanite, andalusite and garnet may occur.
Kyanite and staurolite may also be mentioned as occasionally occurring.
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 AL 2 SiO 5
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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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