EXAMPLES | WORD ORIGIN 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. Origin of sphene
First recorded in
1805–15, sphene is from the Greek word sphḗn wedge
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for sphene Historical Examples of sphene
Reddish grains of
sphene or of garnet are occasionally visible.
The rarer stones,
sphene and epidote, likewise exhibit this property markedly.
The iron oxides, originally ilmenite, are usually altered to
Most gem-stones are harder than quartz, though precious opal, turquoise, moonstone and
sphene are inferior to it in hardness. Sphene, biotite and iron oxides are the other common constituents, but these rocks show much variety of composition and structure. British Dictionary definitions for sphene noun 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: CaTiSiO 5 Also called: titanite Word Origin for sphene
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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: CaTiSiO. 5
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.