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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
1625-1635
1625-35; moon + stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

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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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.

Learn more about moonstone with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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