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[broo k-ahyt] /ˈbrʊk aɪt/
noun, Mineralogy
a brown, red, or black mineral, titanium dioxide, TiO 2 , trimorphous with rutile and anatase.
1875-80; named after H. J. Brooke (1771-1857), English mineralogist; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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  • The brookite-supported gold catalyst sustains the highest catalytic activity after all treatments.
British Dictionary definitions for brookite


a reddish-brown to black mineral consisting of titanium oxide in orthorhombic crystalline form: occurs in silica veins. Formula: TiO2
Word Origin
C19: named after Henry J. Brooke (died 1857), English mineralogist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for brookite

one of three minerals composed of titanium dioxide (TiO2) (see also rutile; anatase). It typically occurs as brown, metallic crystals in veins in gneiss and schist; it is also found in placer deposits and, less commonly, in zones of contact metamorphism. It is widespread in veins in the Alps; in Fronolen, north Wales, it forms crystals on crevice walls in diabase. Brookite forms crystals that belong to the orthorhombic system. For detailed physical properties, see oxide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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