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 rocks comprise plagioclase, perthite, quartz, and small amounts of biotite, opaque oxide, titanite, rare allanite, and secondary chlorite (after biotite), leucoxene and epidote.
13827 was medium-grained biotite granite with directionless structure.
The studied rocks were concentrated biotite ("biotite") (Mogi das Cruzes, Sao Paulo State), nepheline syenite ("syenite") (Pocos de Caldas plateau, Minas Gerais State), and green banded argillite ("argillite") (Cedro de Abaete region, Minas Gerais State).
Plagioclase is ignored by the diagram (CaO is not plotted), but we can resolve biotite and garnet because they clearly have different compositions in the AFM plot.
There was also found a lineation in the foliation plane, caused by elongation of biotite - amphibole aggregates.
Similar 40Ar/39Ar ages were reported for muscovite (484, 524 Ma) and biotite (485 Ma) from the area of Melford Formation to the south near Melford (Campbell 1990; Keppie et al.
During the research character of the influence of enrichment (sieving of silty fraction) on reduction of cement and water demand, as well as on the increase od the quality factor of wastes of wet magnetic separation as a component of composite binder was revealed, that is explained by the decrease in concentration of biotite in the total mass.
The presence of felsic volcanic lithic fragments, muscovite and biotite suggests an acidic igneous input.
In conclusion results suggest that the synthesized Mn- biotite can be used as good ion exchanger with high performance to remove heavy metals and some radioactive species from wastewater.
The mineralization is hosted in a wide and intense zone of biotite hornfels with abundant pyrite and arsenopyrite within Knob Hill Formation sediments (Table 1).