titanite

titanite
/tuyt"n uyt'/, n. Mineral.
sphene.
[1790-1800; < G Titanit. See TITANIUM, -ITE1]

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also called  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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Universalium. 2010.

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