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cyanite > define

noun

  • A grey or greenish-blue mineral consisting of aluminum silicate in crystalline form; occurs in metaphoric rock, used as a refractory.
by WordNet 3.0 © 2006 by Princeton University
(n.) A mineral occuring in thin-bladed crystals and crystalline aggregates, of a sky-blue color. It is a silicate of aluminium.
by Webster's Revised Unabridged Dictionary