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kyanite

kyanite An important metamorphic index mineral and one of the three Al2SiO5 mineral polymorphs, the other two being sillimanite and andalusite; sp. gr. 3.5–3.6; hardness 4–7 ; triclinic; light to darker blue, sometimes green or yellow, occasionally black; vitreous lustre; crystals usually long, columnar, often flattened and bladed, with occasional stellate intergrowths; cleavage pinacoidal, good {100}, {010}, parting {001}; occurs in regional metamorphic rocks that have been subjected to high pressures and low to moderate temperatures, and may be found in schists or gneisses associated with staurolite and garnet.

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"kyanite." A Dictionary of Earth Sciences. . Encyclopedia.com. 20 Aug. 2017 <http://www.encyclopedia.com>.

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"kyanite." A Dictionary of Earth Sciences. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/kyanite

kyanite

ky·a·nite / ˈkīəˌnīt/ (also cy·a·nite / ˈsīə-/ ) • n. a blue or green crystalline mineral consisting of aluminum silicate, used in heat-resistant ceramics. DERIVATIVES: ky·a·nit·ic / ˌkīəˈnitik/ adj.

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"kyanite." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 20 Aug. 2017 <http://www.encyclopedia.com>.

"kyanite." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 20, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/kyanite

"kyanite." The Oxford Pocket Dictionary of Current English. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/kyanite