brookite

[brook-ahyt]
noun Mineralogy.
a brown, red, or black mineral, titanium dioxide, TiO 2 , trimorphous with rutile and anatase.

Origin:
1875–80; named after H. J. Brooke (1771–1857), English mineralogist; see -ite1

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World English Dictionary
brookite (ˈbrʊkaɪt)
 
n
a reddish-brown to black mineral consisting of titanium oxide in orthorhombic crystalline form: occurs in silica veins. Formula: TiO2
 
[C19: named after Henry J. Brooke (died 1857), English mineralogist]

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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Example sentences
The brookite-supported gold catalyst sustains the highest catalytic activity after all treatments.
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