brookite

American

[brook-ahyt] / ˈbrʊk aɪt /

noun

Mineralogy.

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

brookite British

/ ˈbrʊkaɪt /

noun

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

Etymology

Origin of brookite

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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.

From Project Gutenberg

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

From Project Gutenberg

Two types of brookite crystals may be distinguished.

From Project Gutenberg

The lustre of brookite is metallic-adamantine.

From Project Gutenberg

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

From Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023