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

1785–95; irregular < Greek kýan(os) cyan + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
kyanite or cyanite (ˈkaɪəˌnaɪt)
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
cyanite or cyanite
kyanitic or cyanite

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American Heritage
Science Dictionary
kyanite   (kī'ə-nīt')  Pronunciation Key 
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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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Statistics and information on the worldwide supply, demand, and flow of kyanite mullite.
US kyanite were averaged to estimate unit value for kyanite.
Several abandoned gold mines and significant reserves of kyanite are located within the area.
Kyanite forms in metamorphic rocks at moderate temperature and high pressure.
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