Formula: TiO2
Origin of name: For Henry Brooke, English mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: Possible on {120}
Unit cell: a = 5.456 Ǻ, b = 9.182 Ǻ, c = 5.143 Ǻ
Colour: Light brown to dark brown, dark reddish brown, black
Diaphaneity:
Luster: Adamantine to submetallic
Habit: Crystals tabular, vertically striated, varied habit
Hardness: 5.5 to 6
Specific gravity: 4.14
Cleavage: 2; {120} indistinct, {001} traces
Tenacity: Subconchoidal to uneven; brittle
Streak: White to gray or yellow
Synonyms/varieties:
Comments: Trimorphous with anatase and rutile
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