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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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British Dictionary definitions for moon-stone

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 moon-stone

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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