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kyanite

[ kahy-uh-nahyt ]

noun

  1. a mineral, aluminum silicate, Al 2 SiO 5 , occurring in blue or greenish bladed triclinic crystals, used as a refractory.


kyanite

/ ˈkaɪəˌnaɪt; ˌkaɪəˈnɪtɪk /

noun

  1. 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


kyanite

/ ə-nīt′ /

  1. 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: Al 2 SiO 5 .


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Derived Forms

  • kyanitic, adjective
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Word History and Origins

Origin of kyanite1

1785–95; irregular < Greek kýan ( os ) cyan + -ite 1
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Example Sentences

In mica-gneisses sillimanite, kyanite, andalusite and garnet may occur.

Kyanite and staurolite may also be mentioned as occasionally occurring.

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