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Meaning of coesite

coes•ite

Pronunciation: (kō'sīt), [key]
— n. Mineral.
  1. 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.