rutile

A lustrous red, reddish-brown, or black mineral, TiO₂, used as a gemstone, as an ore, and in paints and fillers.

One of the three forms in which titanium dioxid occurs in nature. (See also octahedrite and brookite.)

A mineral usually of a reddish brown color, and brilliant metallic adamantine luster, occurring in tetragonal crystals. In composition it is titanium dioxide, like octahedrite and brookite.

The most frequent of the three polymorphs of titanium dioxide, crystalizing in the tetragonal system, TiO2.

a mineral consisting of titanium dioxide in crystalline form; occurs in metamorphic and plutonic rocks and is a major source of titanium