biotite


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Related to biotite: biotite schist

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 ?
The rock is medium to coarse grained and consist of quartz, alkali feldspar and plagioclase as major mineral however, muscovite, biotite, tourmaline, epidote and apatite are also present in minor quantities.
The effects of dietary Biotite V supplementation on growth performance, nutrients digestibility and fecal noxious gas content in finishing pigs.
Intensive chloritization of the metasomatic biotite is observed in the Xinzhou 1000 m drill cores, and chloritization is an essential process in which Mg-rich chlorite is produced.
In order to break the stable structure of microcline, natrolite, biotite, and muscovite for forming the active aluminosilicate to synthesize zeolite, and leaching out [K.sup.+] ions from hydrothermal product, the whole experiment was designed into two parts: soda roasting and hydrothermal crystallization.
These rock-forming minerals were quartz, potassium feldspar, plagioclase, muscovite, biotite and amphibole.
(1990) the high-grade metamorphic rocks in both the Chuggin Road and Lime Hill units include biotite, bioitite-cordierite, and sillimanite-bearing paragneiss, migmatitic paragneiss, marble, quartzite, amphibolite, and tonalitic orthogneiss.
Like these granitoids, the Vlc-2 granodiorite is different from the Palaeoproterozoic charnockites of the Kursiai intrusion in Lithuania by lacking orthopyroxene but being rich in amphibole and brown biotite, which indicates lower temperatures of crystallization and somewhat higher contents of [H.sub.2]O.