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Meaning of tridymite

trid•y•mite

Pronunciation: (trid'u-mīt"), [key]
— n. Mineral.
  1. a polymorph of quartz occurring in the form of small crystals, commonly twinned, in siliceous volcanic rocks.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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