Titanite or sphene is a calcium titanium nesosilicate mineral. The name is derived from the Greek word
sphenos meaning ‘wedge’. The traces of impurities usually present are iron and aluminium. Rare earth metals cerium and yttrium may also be present. Thorium may replace Calcium in titanite.

Titanite occurs as a common accessory mineral in intermediate and felsic igneous rocks and associated pegmatites. Important sources include Pakistan, Italy, Russia, China, Brazil, Austria, Madagascar, Canada and California.

Titanite is a source of titanium dioxide used in pigments. As a gemstone it has an exceptionally good dispersive power.