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sphene

[sfeen] /sfin/
noun
1.
a mineral, calcium titanium silicate, CaTiSiO 5 , occurring as an accessory mineral in a variety of crystalline rocks, usually in small wedge-shaped crystals.
Also called titanite.
Origin
1805-1815
1805-15; < Greek sphḗn wedge
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sphene

sphene

/sfiːn/
noun
1.
a brown, yellow, green, or grey lustrous mineral consisting of calcium titanium silicate in monoclinic crystalline form. It occurs in metamorphic and acid igneous rocks and is used as a gemstone. Formula: CaTiSiO5 Also called titanite
Word Origin
C19: from French sphène, from Greek sphēn a wedge, alluding to its crystals
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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sphene in Science
sphene
  (sfēn)   
A brown or yellow monoclinic mineral occurring as an accessory mineral in igneous and metamorphic rocks. It usually occurs as wedge or lozenge-shaped crystals. Chemical formula: CaTiSiO5.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for sphene

titanium and calcium silicate mineral, CaTiSiO4(O,OH,F), that, in a crystallized or compact form, makes up a minor component of many igneous rocks and gneiss, schist, crystalline limestone, and pegmatite. Occurrences include the Tirol, Austria; Trentino, Italy; Norway; Switzerland; Madagascar; and the United States (New York). Titanite's relatively high dispersion causes it to be a brilliant gem of various colours; it is usually faceted. For detailed physical properties, see silicate mineral (table)

Learn more about sphene with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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