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phenacite

[fen-uh-sahyt] /ˈfɛn əˌsaɪt/
noun
1.
a rare vitreous mineral, beryllium silicate, Be 2 SiO 4 , occurring in crystals, sometimes used as a gem.
Also, phenakite
[fen-uh-kahyt] /ˈfɛn əˌkaɪt/ (Show IPA)
.
Origin
1825-1835
1825-35; < Greek phenak- (stem of phénax) a cheat, quack + -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for phenakite

phenacite

/ˈfɛnəˌsaɪt/
noun
1.
a colourless or white glassy mineral consisting of beryllium silicate in hexagonal crystalline form: occurs in veins in granite. Formula: Be2SiO4
Word Origin
C19: from Greek phenax a cheat, because of its deceptive resemblance to quartz
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for phenakite

phenacite

rare mineral, beryllium silicate, Be2SiO4, used as a gemstone. Phenakite has long been known from the emerald and chrysoberyl mine on the Takovaya River, near Yekaterinburg (formerly Sverdlovsk), in the Urals region of Russia, where large crystals occur in mica schist. It also occurs in the granite of the Ilmen Mountains in the Urals and of the Pikes Peak region in Colorado. Other notable localities include Kragero, Norway, and San Miguel de Piricicaba, Brazil. For detailed physical properties, see silicate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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