brookite

[brook-ahyt]

noun

Mineralogy.

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

brookite

/ ˈbrʊkaɪt /

noun

1. a reddish-brown to black mineral consisting of titanium oxide in orthorhombic crystalline form: occurs in silica veins. Formula: TiO 2

Word History and Origins

Origin of brookite¹

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

Word History and Origins

Origin of brookite¹

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

Example Sentences

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

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Two types of brookite crystals may be distinguished.

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The lustre of brookite is metallic-adamantine.

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Brookite occurs only as crystals, never in compact masses, and is usually associated with either anatase or rutile.

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