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 ?
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.
25 km east of the Prince of Wales target, a significant zone of sulphide bearing biotite hornfels within Knob Hill Formation sediments was intersected adjacent to an intensely propylitic altered diorite in drillhole 10CM06, yielding 0.
The effects of dietary Biotite V supplementation as an alternative substance to antibiotics in growing pigs.
39]Ar method also provides insight into the cooling ages of biotite and hornblende and the uplift history of the rocks in which they are contained, but space limitations prevent further discussion.
Gilkes RJ, Suddhiprakarn A (1979) Biotite alteration in deeply weathered granite.
K-Ar dating of biotite and amphibole from the granitic bodies cutting Svecofennian metamorphic complexes in NE Estonia yielded the ages of 1.
However loosely, the basement is grouped into three major groups lithostratigraphically viz: the Migmatite-Gneiss Quartzite Complex: comprising biotite and biotite hornblende gneisses, quartzites and quartz schist.
39]Ar dates from hornblende, muscovite, and biotite in both the gneiss and amphibolite sheets in the gneiss (Keppie and Dallmeyer 1989; Reynolds et al.
Hole G2P-1 0 to 147m Biotite quartz, muscovite, feldspar, garnet schist/micro gneiss with varying graphite, pyrite and magnetite as accessories.
This middle Eocene cooling age is confirmed by hornblende and biotite K/Ar ages in the range 45-47 Ma reported in Cardona et al.
The major lithostratigraphic units in the study area include garnet bearing charnockitic, garnet rich and sillimanite rich metapellataic geneisses (khondalitic) and garnet biotite quartz feldspar gneisses underlain by black cotton soil Chetty Q996),Braun et.