General Annite Information : Chemical Formula: KFe++3AlSi3O10(OH,F)2 : Composition: Molecular Weight = 512.88 gm Potassium 7.62 % K 9.18 % K 2 O: Aluminum 5.26 % Al 9.94 % Al 2 O 3: Iron 32.67 % Fe 42.03 % FeO: Silicon 16.43 % Si 35.15 % SiO 2: Hydrogen 0.29 % H 2.63 % H 2 O: Oxygen 35.87 % O: Fluorine 1.85 % F 1.85 % F

Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K3AlSi3O102. It is a solid-solution series between the iron-endmember annite, the magnesium-endmember phlogopite.Biotite was regarded as a mineral species by the International Mineralogical Association until 1998, when its status was changed to a mineral group; the term biotite …

Biotite definition, a very common mineral of the mica group, occurring in black, dark-brown, or dark-green sheets and flakes: an important constituent of igneous and metamorphic rocks. See more.

Biotite - K(Mg,Fe 2+) 3 [AlSi 3 O 10 (OH,F) 2 Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula K(Mg,Fe) 3 AlSi 3 O 10 (F,OH) 2.Biotite is a solid solution between the end members Phlogopite KMg 3 AlSi 3 O 10 (OH) 2 and Annite KFe 3 AlSi 3 O 10 (OH) 2, although pure Annite does not occur in nature.In addition, small amounts of Na, Rb, Cs ...

Biotite is a common phyllosilicate mineral within the mica group. Its approximate chemical formula is K(Mg, Fe) 3 AlSi 3 O 10 (F, OH) 2.This mineral is usually dark green to brown or black. It can be transparent to opaque, has a vitreous to pearly luster, and a gray-white streak.

A barium- and titanium-bearing biotite mica. Chrom-Biotit: A Cr-bearing variety of biotite. Chromium-bearing Biotite: A Cr-bearing variety of biotite. Eastonite (of Winchell) A name for the Biotite end-member. Heterophyllite: Designation for a uniaxial biotite from Mangualde, Portugal. Manganophyllite: A Mn-rich variety of Biotite. Mg(T) Mica

Biotite, a silicate mineral in the common mica group. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks. For chemical formula and detailed physical properties, see mica (table). Biotite is regarded as a mixture

Biotite provides nutrients for plants upon weathering by release of 2. UNWEATHERED BIOTITE 2.1. MINERALOGICAL DESCRIPTION 2.1.1. Chemical composition Biotite comprises a series of monoclinic minerals of the mica group that may be represented by the generalized formula : K(Mg, Fe2+)3-1.5 (Al, Fe3+)0-1 (A11-1.5 Si3-2.5 010) (OH, F)2 (Tröger, 1969).

Biotite is a dark-brown or dark-green to black mica. Biotite is monoclinic and is found in igneous, metamorphic, and sedimentary rocks. It was named by J.F.L. Hausmann in 1847 in honor of the French physicist Jean-Baptiste Biot, who performed early research into the many optical properties of mica. Its chemical formula: K(Mg,Fe) 3 (Al,Fe)Si 3 O ...

The high iron content, which imparts dark colors, rules out biotite from many industrial uses. However, because biotite is abundant in granitic rocks, pegmatites, and schists that are also associated with the more desirable muscovites, the mineral is important for exploration. Biotite is …

Aug 12, 2019· What is Biotite? Biotite is a phyllosilicate mineral that mainly contains magnesium and potassium. Moreover, its chemical formula can be given as K(Mg,Fe) 3 AlSi 3 O 10 (F,OH) 2. Also, this is a sheet silicate. The sheets weakly bind to each other via potassium ions.

General Biotite Information : Chemical Formula: K(Mg,Fe++)3[AlSi3O10(OH,F)2 : Composition: Molecular Weight = 433.53 gm Potassium 9.02 % K 10.86 % K 2 O: Magnesium 14.02 % Mg 23.24 % MgO: Aluminum 6.22 % Al 11.76 % Al 2 O 3: Iron 6.44 % Fe 8.29 % FeO: Silicon 19.44 % Si 41.58 % SiO 2: Hydrogen 0.41 % H 3.64 % H 2 O: Oxygen 43.36 % O

Biotite is a member of the mica branch of the silicate mineral group.It is common as a rock-forming mineral and is found associated with muscovite, feldspar, and quartz. It has a widespread occurance and is present in all three rock types igneous, metamorphic, and sedimentary.

Biotite has the chemical formula,K(Mg,Fe)3(AlSi3O10)(F,OH)2. Is Biotite a felsic or mafic silicate mineral? A. felsic B. mafic

Muscovite is an extremely common mineral, nevertheless there are some exceptional localities that need to be mentioned. Outstanding Muscovite crystals, some bright yellow and others with perfect star formations, come from the famous pegmatite localites in the Doce and Jequitinhonha Valleys in Minas Gerais Brazil. Specific localities include Divino das Laranjeiras ("stars"),Galileia, Governador ...

Biotite has the chemical formula,K(Mg,Fe)3(AlSi3O10)(F,OH)2. Is Biotite a felsic or mafic silicate mineral? A. felsic B. mafic

biotite definition: a dark-colored, soft, monoclinic mica, K(Mg,Fe)(Al,Fe)SiO(OH), found in igneous, metamorphic, and sedimentary rocksOrigin of biotiteGerman biotit: so named after J. B. Biot (1774-1862), French physicist + -it, -ite...

Biotite, a silicate mineral in the common mica group It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks For chemical formula and detailed physical properties, see mica (table) Biotite is regarded as a mixture.

Biotite provides nutrients for plants upon weathering by release of 2. UNWEATHERED BIOTITE 2.1. MINERALOGICAL DESCRIPTION 2.1.1. Chemical composition Biotite comprises a series of monoclinic minerals of the mica group that may be represented by the generalized formula : K(Mg, Fe2+)3-1.5 (Al, Fe3+)0-1 (A11-1.5 Si3-2.5 010) (OH, F)2 (Tröger, 1969).

The structural chemical formula of the muscovite sample is (N% 0.15 K 1.82 Ca 0.003)[Al 3.39 Fe (III) 0.40 Fe (II) 0.15 Mn 0.04 Mg 0.44][Si 6.18 Al 1.82]O 20 (OH) 3.91 F 0.09 These authors used a flow-through reactor in which the mineral suspension was separated from the …

Mica, any of a group of hydrous potassium, aluminum silicate minerals. It is a type of phyllosilicate, exhibiting a two-dimensional sheet or layer structure. Among the principal rock-forming minerals, micas are found in all three major rock varieties—igneous, sedimentary, and metamorphic.

Biotite, the more abundant of the two minerals, is the iron-rich end member of the series while phlogopite is the magnesium-rich end member. ^ Top. Geologic Setting and Associated Minerals. An important rock-forming mineral in felsic and intermediate igneous rocks, biotite …

Chemical Formula: The classic formula for Biotite is: K(Mg,Fe 2+ 3)(Al,Fe 3+)Si 3 O 10 (OH,F) 2 The group formula including all member minerals: K(Mg,Fe 2+) 3 (Al,Fe 3+)[(Al,Si) 3 O 10](OH,F) 2 Individual members are: Phlogopite: KMg 3 AlSi 3 O 10)(F,OH) 2 Siderophyllite: KFe 2+ 2 Al(AlSi 2 O 10)(OH) 2 Eastonite: KMg 2 Al(AlSi 2 O 10)(OH) 2 Annite: KFe 2+ 3 AlSi 3 O 10 (OH) 2 Fluorannite: KFe ...

Jan 01, 2015· The chemical ranges are X Fe = 0.19–0.55, X Mg = 0.23–0.67, and X Ti = 0.02–0.14 for biotites, on the basis of 11 oxygen per formula unit, in which X j = j/(Fe + Mg + Al VI + Ti) in biotite. It should be stated that such compositional ranges cover more than 98% of the natural biotites in rutile- or ilmenite-bearing metapelites.