Definitions for kyaniteˈkaɪ əˌnaɪt
This page provides all possible meanings and translations of the word kyanite
Random House Webster's College Dictionary
a mineral, aluminum silicate, Al2SiO5, occurring in bluish bladed crystals or in masses, used as a refractory.
Origin of kyanite:
1785–95; < Gk kýan(os) blue enamel (see cyano-1) + -ite1
a grey or greenish-blue mineral consisting of aluminum silicate in crystalline form; occurs in metaphoric rock, used as a refractory
a blue neosilicate mineral, AlSiO, found in metamorphic rocks
Kyanite, whose name derives from the Greek word kuanos sometimes referred to as "kyanos", meaning deep blue, is a typically blue silicate mineral, commonly found in aluminium-rich metamorphic pegmatites and/or sedimentary rock. Kyanite in metamorphic rocks generally indicates pressures higher than four kilobars. Although potentially stable at lower pressure and low temperature, the activity of water is usually high enough under such conditions that it is replaced by hydrous aluminosilicates such as muscovite, pyrophyllite, or kaolinite. Kyanite is also known as disthene, rhaeticite and cyanite. Kyanite is a member of the aluminosilicate series, which also includes the polymorph andalusite and the polymorph sillimanite. Kyanite is strongly anisotropic, in that its hardness varies depending on its crystallographic direction. In kyanite, this anisotropism can be considered an identifying characteristic. At temperatures above 1100 °C kyanite decomposes into mullite and vitreous silica via the following reaction: 3 → 3Al2O3·2SiO2 + SiO2. This transformation results in an expansion.
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