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Brookite (Photo) [abbr. Brk ]
Year of discovery: 1825 (Twll Maen Grisial, UK), 1916 (Japan)
Locality list: 27 localities of brookite
- Polymorph: Anatase (Tetragonal), Rutile (Tetragonal), Akaogiite (Monoclinic)
- Ti => Ge: Argutite
- Ti => Sn: Cassiterite
- Ti => Pb: Scrutinyite (α), Plattnerite
- Ti => Mn: Pyrolusite (β), Ramsdellite (γ), Akhtenskite (ε)
- Ti => Si: Quartz (α), β-Quartz (β), Tridymite, Cristobalite, Coesite, Stishovite, Mogánite (Moganite)
- Ti => V: Paramontroseite
- Ti => Mo: Tugarinovite
- Ti => U: Uraninite
- Ti => Th: Thorianite
- Ti => Ce: Cerianite-(Ce)
- Ti => Se: Downeyite
- Ti => Zr: Baddeleyite
- Ti => Te: Tellurite, Paratellurite
- Color: Brown
- Streak: Pale yellow
- Luster: Adamantine
- Diaphaneity: Translucent-Opaque
- Cleavage: Indistinct on {120} (2 planes)
- Hardness: 5.5-6
- Density: 4.1
- System: Orthorhombic
- Group: mmm, Pcab
- Lattice: a=5.5, b=9.2, c=5.1
Etymology: H. T. Brookite, British mineralogist