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Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K (Mg,Fe)3AlSi3O10(F,OH)2. It is primarily a solid-solution series between the iron - endmember annite, and the magnesium -endmember phlogopite; more aluminous end-members include siderophyllite and eastonite.
Subcategories. This category has the following 16 subcategories, out of 16 total. Biotite in the United States (1 C) Annite (7 F) Biotite gneiss (4 C, 5 F) Biotite Granite (4 C, 10 F) Biotite granodiorite (2 C) Biotite in Arkansas (1 F) Biotite in France (5 C) Biotite monzogranite (3 C) Biotite of Catalonia (2 F)
Biotite is a sheet silicate. Airn , magnesium , aluminium , silicon , oxygen , an hydrogen furm sheets that are waikly boond thegither bi potassium ions. It is whiles cried "iron mica" acause it is mair airn-rich nor phlogopite.
La biotite est un minéral, du groupe des silicates, sous-groupe des phyllosilicates de la famille des micas. De formule idéale K (Mg,Fe) 3 (OH,F) 2 Si 3 AlO 10, elle contient généralement des traces de Mn, Ti, Li, Ba, Na, Sr, Cs, Fe et Cl. Elle forme une série avec le phlogopite .
Biotite and amphiboles often in the form of hornblende are more abundant in granodiorite than in granite, giving it a more distinct two-toned or overall darker appearance. Mica may be present in well-formed hexagonal crystals, and hornblende may appear as needle-like crystals.
Biotita ( português brasileiro) ou biotite ( português europeu) é um mineral comum da classe dos silicatos, subclasse dos filossilicatos , grupo das micas e subgrupo ferromagnesianas, formando uma série com o mineral flogopita, que contem na sua composição potássio, magnésio, ferro e alumínio.
Garnet-biotite geothermometry is a method used to evaluate the peak temperature at which metamorphic rocks have formed. Geothermometry makes up one component of geothermobarometry , which also includes the evaluation of pressure (geobarometry).
