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moonstone

[moon-stohn] /ˈmunˌstoʊn/
noun
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.
Origin of moonstone
1625-1635
1625-35; moon + stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for moonstone

moonstone

/ˈmuːnˌstəʊn/
noun
1.
a gem variety of orthoclase or albite that is white and translucent with bluish reflections
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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