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phenacite

[ fen-uh-sahyt ]

noun

  1. a rare vitreous mineral, beryllium silicate, Be 2 SiO 4 , occurring in crystals, sometimes used as a gem.


phenacite

/ ˈfɛnəˌsaɪt; ˈfɛnəˌkaɪt /

noun

  1. a colourless or white glassy mineral consisting of beryllium silicate in hexagonal crystalline form: occurs in veins in granite. Formula: Be 2 SiO 4
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of phenacite1

1825–35; < Greek phenak- (stem of phénax ) a cheat, quack + -ite 1
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Word History and Origins

Origin of phenacite1

C19: from Greek phenax a cheat, because of its deceptive resemblance to quartz
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Example Sentences

N.E. of Ekaterinburg, where they occur in mica-schist, associated with aquamarine, alexandrite, phenacite, &c.

This lower degree of symmetry, which is the same as that of dioptase and phenacite, is occasionally shown by the presence of an obliquely placed rhombohedron, and also by the want of symmetry in the etching and elasticity figures on the faces of the primitive rhombohedron.

The degree of symmetry is the same as in the mineral phenacite, there being only an axis of triad symmetry and a centre of symmetry.

The largest phenacite crystal ever found is owned by Mr. Whitman Cross.

It never occurs naturally in the free state, but is always combined, usually with silica or alumina, or both; as in the minerals phenacite, chrysoberyl, beryl or emerald, euclase, and danalite.

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phenacetinphenanthrene