brookite

American  

[brook-ahyt] / ˈbrʊk aɪt /

noun

Mineralogy.

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

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brookite British  

/ ˈbrʊkaɪt /

noun

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

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Etymology

Origin of brookite

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

Example Sentences

A set of specimens was exhibited by the Ellenville Zinc Company, consisting of strikingly beautiful crystalline masses of quartz galina, sphalerite and chalcopyrite and specimens of the rare mineral, brookite.

From New York at the Louisiana Purchase Exposition, St. Louis 1904 Report of the New York State Commission by Ellis, DeLancey M.

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

From Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" by Various

Titanic acid occurs in nature crystallized in anatase, arkansite, brookite, and rutile.

From A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations by Anonymous

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

From Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" by Various

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 Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various