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Brookite (Photo) [abbr. Brk ]

Year of discovery: 1825 (Twll Maen Grisial, UK), 1916 (Japan)

Locality list: 27 localities of brookite

• TiO₂
• [Ti⁴⁺][O₂]^4-

• Class: Oxide
• Insoluble in: HCl

• 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

• Habit: Thin Platy

• 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