[tahyt-n-ahyt] 
[sfeen] ,| a mineral, calcium titanium silicate, CaTiSiO5, occurring as an accessory mineral in a variety of crystalline rocks, usually in small wedge-shaped crystals. |
| sphene (sfēn) n. 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. [French sphène, from Greek sphēn, wedge.] |
| ti·tan·ite (tīt'n-īt') n. See sphene. |
| 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. |
titanite
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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