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Meaning of eucryptite

eu•cryp•tite

Pronunciation: (y-krip'tīt), [key]
— n.
  1. a mineral, lithium aluminum silicate, LiAlSiO, occurring in colorless to white hexagonal crystals: used as a source of lithium.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.