a naturally occurring crystalline form of titanium dioxide, TiO 2 .
Historical Examples

Minute crystals of brookite have been detected with anatase and rutile in the iron-ore of Cleveland in Yorkshire.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 Various

There is no distinct cleavage (rutile and anatase have cleavages); hardness 5-6; sp.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 Various

Titanic acid occurs in nature crystallized in anatase, arkansite, brookite, and rutile.
A System of Instruction in the Practical Use of the Blowpipe Anonymous

a rare blue or black mineral that consists of titanium oxide in tetragonal crystalline form and occurs in veins in igneous rocks. Formula: TiO2 Also called octahedrite


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