Dictionarymoon•stonePronunciation: (mOOn'stōn"), [key] —n. 1. Also called precious moonstone. a semitransparent or translucent, opalescent, pearly-blue variety of adularia, used as a gem. 2. any of several adularescent feldspars, as certain varieties of albite, labradorite, or oligoclase, used as gems. 3. (not used technically) any milky or girasol stone used as a gem. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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