biotite

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biotite

(bī`ətīt'), iron-rich variety of phlogopite, most abdunant of the micamica
, general term for a large group of minerals, hydrous silicates of aluminum and potassium, often containing magnesium, ferrous iron, ferric iron, sodium, and lithium and more rarely containing barium, chromium, and fluorine.
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 minerals.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Biotite

 

(after the French scientist J. B. Biot, 1774–1862), a mineral of the mica group. Biotite is structurally related to the micaceous aluminosilicates. Its chemical formula is K(Mg, Fe)3AlSi3O10(OH,F)2. The color of the thin sheets is from blackish-brown to brownish-green. Biotite occurs widely as a rock-forming mineral in igneous and metamorphic rocks. The largest biotite crystals, reaching 1–1.5 m, are found in pegmatite veins. Biotite is used in light-duty electrical insulating articles, and its powder is used in the preparation of bronze paint.,

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

biotite

[′bī·ə‚tīt]
(mineralogy)
A black, brown, or dark green, abundant and widely distributed species of rock-forming mineral in the mica group; its chemical composition is variable: K2[Fe(II),Mg]6-4[Fe(III),Al,Ti]0-2(Si6-5,Al2-3)O20-22(OH,F)4-2. Also known as black mica; iron mica; magnesia mica; magnesium-iron mica.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
There are several samples of granitic clasts whose composition varies from quartz-syenites (alkali feldspar rich) to biotite-amphibole granodiorites and biotitic monzogranites.
This pluton is a concentrically zoned body, elongated in the N-S direction, with biotitic, porphyritic granites at the rim and fine-grained two-mica leucogranites the core.
1), which comprises a belt of fragmented blocks of metamorphic crystalline limestones and dolomites set inside predominating biotitic paragneisses (Kukla and Skrvanek, 1954).