moon-stone

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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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
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