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Answer for the clue "A gray or greenish-blue mineral consisting of aluminum silicate in crystalline form ", 7 letters:
cyanite

Alternative clues for the word cyanite

Word definitions for cyanite in dictionaries

Wiktionary Word definitions in Wiktionary
n. (alternative form of kyanite English)

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: kyanite ]

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 .]

Usage examples of cyanite.

June sky stood out a clear cyanite blue, stripped of clouds, and the air had a rain-washed freshness that it had lacked that morning.