Kyanite definitions

sī'ə-
A bluish-green to colorless mineral, Al2 SiO5 , used as a refractory.
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A bluish silicate of aluminum, Al2SiO5, that forms in long, thin, bladed crystals that are found in metamorphic rocks.
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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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A blue neosilicate mineral, Al2SiO5, found in metamorphic rocks.
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Origin of kyanite

Greek kuanos dark blue enamel –ite