Brookite



a brown, red, or black mineral, titanium dioxide, TiO 2 , trimorphous with rutile and anatase.
Historical Examples

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 Various
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 Various
A System of Instruction in the Practical Use of the Blowpipe Anonymous

noun
a reddish-brown to black mineral consisting of titanium oxide in orthorhombic crystalline form: occurs in silica veins. Formula: TiO2

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