biotite chemical formula
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Vermiculite is an expanding clay like smectite. Simplified formula more commonly used is based on the more common species regarded as 'biotite' subgroup. (1983) Titanium, aluminium and interlayer cation substitution in biotite from high-grade gneisses, West Greenland. Phlogopite is usually more brownish or even fiery looking. An anomalous (hence the name) variety of "biotite" which has its optic axial plane perpendicular to (010). Introduction. Vermiculite is an alteration product of biotite which expands greatly when heated (shown on the picture). Comptes Rendus de l'Académie des Sciences (Paris): 318: 501-506. 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 (1999) Nomenclature of the Micas. Siderophyllite and annite are also more like a theoretical end-members because some of the iron in their crystal lattice is always substituted by magnesium. not electrically conductive. (1996). Excalibur Minerals Explore/observe features. Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. Width of sample 9 cm. Width of sample 10 cm. The micaceous character, however, may not be immediately obvious if the rock is fine-grained. (1979) Secondary Ca-Al silicates as low-grade alteration products of granitoid biotite. No biotite here. It is least common in mafic rocks, but these too host it sometimes. Width of sample 9 cm. Width of sample 13 cm. printWin.document.close(); Black. Width of sample 22 cm. else Contributions to Mineralogy & Petrology: 69: 105-117. This mineral name, however, is also no longer in official use. Dymek, R.F. return; and McKinney, C.N. However, phlogopite is often recognizably colored and has somewhat different occurrence which makes it logical to treat it separately from the other more iron-rich varieties. Larvik, Norway. Rieder, M., Cavazzani, G., D'Yakonov, Y.S., Frank-Kamenetskii, V.A., Gottardi, G., Guggenheim, S., Koval, P.V., Müller, G., Neiva, A.M.R., Radaslovich, E.W., Robert, J.-L., Sassi, F.P., Takeda, H., Weiss, Z., and Wones, D.R. K2Fe6[Si6Al2O20](OH)4 – annite Luumäki, Finland. It is used as a filler and insulating material in the construction industry. dolomite + muscovite → biotite + chlorite + calcite + CO21. Phlogopite with apatite (greenish yellow) and enstatite (dark green) in pegmatite. Width of sample 7 cm. A barium- and titanium-bearing biotite mica. Phlogopite has typically more brownish or fiery look than black iron-rich biotites. Nepheline syenite. Width of sample 11 cm. 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.The name “biotite” is used in the field and in entry-level geology courses because these minerals generally cannot be distinguished without optical, chemical, or x-ray analysis. Vermiculite enhances drainage and aeration because of low density and absorbs water to later slowly release it when the soil is drying up. Economic Geology: 58: 1126-1144. { Evje, Norway. } Width of sample 10 cm. Scale: 6.9x5.5x3 cm. Biotite with garnet. (, This map shows a selection of localities that have latitude and longitude coordinates recorded. Width of sample 13 cm. But clay mineral vermiculite which forms as an alteration product (either weathering or hydrothermal) of iron-bearing varieties has several uses. Tonalite. Shabani, A. and Lalonde, E. (2003) Composition of biotite from granitic rocks of the Canadian Appalachian orogen: a potential tectonomagmatic indicator? Biotite with other micas are sheet silicates – their structure is composed of many sheetlike layers which are connected to each-other by weak chemical bonds.
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