sphene

sphene

[sfeen]
noun
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:
1805–15; < Greek sphḗn wedge

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World English Dictionary
sphene (sfiːn)
 
n
Also called: titanite 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
 
[C19: from French sphène, from Greek sphēn a wedge, alluding to its crystals]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sphene   (sfēn)  Pronunciation Key 
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 Britannica
Encyclopedia

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)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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