moonstone

[moon-stohn]
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:
1625–35; moon + stone

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
moonstone (ˈmuːnˌstəʊn)
 
n
a gem variety of orthoclase or albite that is white and translucent with bluish reflections

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

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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Example sentences
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.
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