Dictionary  coes•itePronunciation: (kō'sīt), [key] —n. Mineral. a rare form of silicon dioxide, a denser polymorph of quartz, originally synthesized from quartz at high temperatures and pressures: later discovered in nature. Cf. stishovite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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