a variously colored mineral, CaTiSiO, that is an ore of titanium; calcium titanium silicate
Origin:
Fr sphène < Gr sphēn, a wedge (for IE base see spoon): so named because of its crystal form
See sphene in American Heritage Dictionary 4
noun
A titanium accessory mineral in some granite and metamorphic rocks, CaTiSiO5, occurring in usually small brown or yellow crystals and sometimes used as a gemstone. Also called titanite.