A gray or greenish-blue mineral consisting of aluminum silicate in crystalline form

• Occurs in metaphoric rock, used as a refractory

WordNet Word definitions in WordNet
n. a gray or greenish-blue mineral consisting of aluminum silicate in crystalline form; occurs in metaphoric rock, used as a refractory [syn: cyanite ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Cyanite \Cy"a*nite\ (-n?t), n. [See Cyanic .] (Min.) A mineral occuring in thin-bladed crystals and crystalline aggregates, of a sky-blue color. It is a silicate of aluminium. [Written also kyanite .]

Wikipedia Word definitions in Wikipedia
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 ...

Wiktionary Word definitions in Wiktionary
n. a blue neosilicate mineral, Al 2 SiO 5 , found in metamorphic rocks