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brookite

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brook⋅ite

  [brook-ahyt]
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–noun Mineralogy.
a brown, red, or black mineral, titanium dioxide, TiO2, trimorphous with rutile and anatase.
Origin:
1875–80; named after H. J. Brooke (1771–1857), English mineralogist; see -ite 1
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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brook·ite   (brŏŏk'īt')   
n.  A mineral form of titanium dioxide, TiO2, having characteristic orthorhombic crystals and a red-brown to black color.

[After Henry James Brooke (1771-1857), British mineralogist.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

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)

Learn more about brookite with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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