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[moon-stohn] /ˈmunˌstoʊn/
Also called precious moonstone. a semitransparent or translucent, opalescent, pearly-blue variety of adularia, used as a gem.
any of several adularescent feldspars, as certain varieties of albite, labradorite, or oligoclase, used as gems.
(not used technically) any milky or girasol stone used as a gem.
1625-35; moon + stone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for moonstone
  • His head-underneath the fake surgical band-ages-is as smooth and hairless as a moonstone.
  • She says that the moon is a planet and that it protects her, so she wears a moonstone.
  • moonstone may be any variety of feldspar which displays a silvery to bluish light caused by reflections.
British Dictionary definitions for moonstone


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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Encyclopedia Article for moonstone

gem-quality feldspar mineral, a mixed sodium and potassium aluminosilicate, (K,Na)AlSi3O8, that shows a silvery or bluish iridescence. Nearly all commercial moonstones come from Dumbara District, Sri Lanka, where they occur in gem gravels and in acid granulites and pegmatites.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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