phenacite

phenacite

[fen-uh-sahyt]
noun
a rare vitreous mineral, beryllium silicate, Be 2 SiO 4 , occurring in crystals, sometimes used as a gem.
Also, phenakite [fen-uh-kahyt] .


Origin:
1825–35; < Greek phenak- (stem of phénax) a cheat, quack + -ite1

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phenacite or phenakite (ˈfɛnəˌsaɪt, ˈfɛnəˌkaɪt)
 
n
a colourless or white glassy mineral consisting of beryllium silicate in hexagonal crystalline form: occurs in veins in granite. Formula: Be2SiO4
 
[C19: from Greek phenax a cheat, because of its deceptive resemblance to quartz]
 
phenakite or phenakite
 
n
 
[C19: from Greek phenax a cheat, because of its deceptive resemblance to quartz]

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Encyclopedia Britannica
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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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