moonstone

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moonstone,

an orthoclase feldsparfeldspar
or felspar
, an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these elements.
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, found in Sri Lanka, Myanmar, and Madagascar (and formerly in the St. Gotthard district of Switzerland). In spite of its pronounced cleavage, it is widely used as a gemgem,
commonly, a mineral or organic substance, cut and polished and used as an ornament. Gems also are used as seals (items of assurance) and as talismans (good-luck charms). For birthstones, see month.
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. The refraction of light by its thin, paired internal layers causes its milky, bluish sheen.

Moonstone

 

a semitransparent variety of orthoclase (adularia) and sometimes plagioclase (albite or oligoclase). Moonstone displays a bluish iridescence. It is occasionally found in pegmatites or alpine-type veins. It is used as a decorative stone for insets and small ornaments. The best moonstone with respect to quality and color is found in Sri Lanka; in the USSR it is found in the pegmatite veins of Karelia.

moonstone

[′mün‚stōn]
(mineralogy)
An alkali feldspar or cryptoperthite that is semitransparent to translucent and exhibits a bluish to milky-white, pearly, or opaline luster; used as a gemstone if flawless. Also known as hecatolite.

moonstone

June alternate birthstone. [Am. Gem Symbolism: Kunz, 319]

moonstone

wrested by an English officer from Buddhist priests, who place a curse on all who possess it. [Br. Lit.: Collins The Moonstone in Benét, 683]
See: Curse

moonstone

sacred stone; brings good fortune. [Gem Symbolism: Kunz, 97–98]

moonstone

a gem variety of orthoclase or albite that is white and translucent with bluish reflections
References in periodicals archive ?
The descriptions, which read rather like a restaurant menu ( 'Carved boar tusk, fire opal, agate, moonstone cab and cornelian beads', or 'Black jade carved by Lou Walker with fossil horses tooth, peach moonstones and reticulated silver') struck me as more fun to read than the actual pieces were to look at.
Above right, a model displays the three piece hand-made silver and gold, rainbow moonstone stacked ring and the aquamarine crystal necklace which President Clinton purchased for his daughter Chelsea and his wife Hillary respectively.