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.

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.,

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.
References in periodicals archive ?
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.
Biotitic alteration occurs throughout the mineralized section.
1), which comprises a belt of fragmented blocks of metamorphic crystalline limestones and dolomites set inside predominating biotitic paragneisses (Kukla and Skrvanek, 1954).
In addition to the gold-carbonate zone, two drill holes hit significant widths of biotitic lamprophyre dyke in structures parallel to the newly discovered diamond bearing lamprophyre.
Several silicified sections with moderate to strong carbonate and biotitic alteration can be followed from BC 10-2 to BC 10-3.
Metamorphic gneisses of various types are the most common bedrock type in the area of interest, most widespread being sillimanit-biotitic paragneiss and biotitic orthogneiss (Muller, ed.