a mineral, calcium titanium silicate, CaTiSiO5, occurring as an accessory mineral in a variety of crystalline rocks, usually in small wedge-shaped crystals.
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The iron oxides, originally ilmenite, are usually altered to sphene.
These rocks contain also iron oxides (usually titaniferous), apatite, sometimes sphene, augite and olivine.
Most gem-stones are harder than quartz, though precious opal, turquoise, moonstone and sphene are inferior to it in hardness.
Reddish grains of sphene or of garnet are occasionally visible.
The rarer stones, sphene and epidote, likewise exhibit this property markedly.