Biotite Definition

A dark-brown or dark-green to black mica, K(Mg,Fe)3 (Al,Fe)Si3 O10 (OH)2 , found in igneous and metamorphic rocks.
American Heritage
A dark-colored, soft, monoclinic mica, K(Mg,Fe)3(Al,Fe)Si3O10(OH)2, found in igneous, metamorphic, and sedimentary rocks.
Webster's New World

(mineralogy) A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.


Origin of Biotite

  • Biot +‎ -ite, named by J.F.L. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, researched the optical properties of mica, discovering many unique properties.

    From Wiktionary

  • After Jean Baptiste Biot (1774–1862), French physicist

    From American Heritage Dictionary of the English Language, 5th Edition

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