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biotite

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.34 sec.
biotite (bī`ətīt'), iron-rich variety of phlogopite, most abdunant of the mica mica (mī`kə), general term for a large group of minerals, hydrous silicates of aluminum and potassium, often containing magnesium,
..... Click the link for more information.  minerals.

biotite

 or black mica

Enlarge picture
Biotite mica from the district of Juchitán, Oaxaca, Mex.
(credit: Courtesy of the Field Museum of Natural History, Chicago; photograph, John H. Gerard-EB Inc.)
Silicate mineral in the common mica group. It is abundant in metamorphic rocks, in pegmatites, and in granites and other igneous rocks. Biotite is a layer silicate structure in which aluminum and silicon occur in infinitely extending Si-Al-O sheets that alternate with potassium-rich and magnesium- (and iron-) containing sheets.
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? Mentioned in ? References in periodicals archive
 
The metamorphosed alteration zones are characterized by the presence of various combinations of anthophyllite, cordierite, garnet, staurolite, biotite and/ or andalusite.
Government geoscience stimulates mineral exploration in the superior ... by Simard, Martin / Geoscience Canada
A poor correlation between the concentration of Fe and As in groundwater from Semaria may be caused by the presence of dissolved Fe in groundwater, which may be partly derived from the weathering of biotite, and by the variable Fe:As ratio in dissolved FeOOH (McArthur et al.
Risk of arsenic contamination in groundwater affecting the Ganga ... by Shah, Babar Ali / Environmental Health Perspectives
The sedimentary rocks have been metamorphosed to biotite hornfels around the contact of the intrusive.
Piedmont Announces First Drill Program Completed At Dutch Flat, Nevada by Business Wire
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