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brookite

[ brook-ahyt ]

noun

Mineralogy.
  1. a brown, red, or black mineral, titanium dioxide, TiO 2 , trimorphous with rutile and anatase.


brookite

/ ˈʊ첹ɪ /

noun

  1. a reddish-brown to black mineral consisting of titanium oxide in orthorhombic crystalline form: occurs in silica veins. Formula: TiO 2
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of brookite1

1875–80; named after H. J. Brooke (1771–1857), English mineralogist; -ite 1
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Word History and Origins

Origin of brookite1

C19: named after Henry J. Brooke (died 1857), English mineralogist
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Example Sentences

Examples have not been reviewed.

In some crystals, e.g. brookite, the optic axes for red light and for blue light may be, at certain temperatures, in planes at right angles.

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Minute crystals of brookite have been detected with anatase and rutile in the iron-ore of Cleveland in Yorkshire.

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Two types of brookite crystals may be distinguished.

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The two latter are tetragonal in crystallization, whilst brookite is orthorhombic.

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The lustre of brookite is metallic-adamantine.

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