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, 2014 Educação Superior::Ciências Exatas e da Terra::GeoCiênciasThis image shows the mineral Biotite, common in the group of silicates and part of the group of micas. It contains potassium, magnesium, iron and aluminum in its composition. As the other minerals
U.S. Geological Survey
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Magnetic interaction in biotites and oxidised biotites
Physics and Chemistry of Minerals, 1987Mossbauer spectra of biotites (1) and (2) with relative iron concentrations ∼1:1·6 and of their oxidation products are recorded at 4 K in zero field and in applied fields up to 5 T. Magnetic susceptibility data are also reported. The results show that Fe III spins are in a ferromagnetic configuration in the c-plane in both biotites.
G. Longworth +3 more
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physica status solidi (b), 1962
AbstractStudies are made of Mössbauer absorption of Fe57 in biotite. The asymmetric double peak spectrum is explained by quadrupole splitting; the energy levels are influenced by the presence of OH‐groups in the octahedral surrounding of the Fe‐ions.
H. Pollak, M. De Coster, S. Amelinckx
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AbstractStudies are made of Mössbauer absorption of Fe57 in biotite. The asymmetric double peak spectrum is explained by quadrupole splitting; the energy levels are influenced by the presence of OH‐groups in the octahedral surrounding of the Fe‐ions.
H. Pollak, M. De Coster, S. Amelinckx
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Trimethylsilylation of Biotite
Clays and Clay Minerals, 1977AbstractOrganic solvent soluble organosilicate compounds retaining silicate backbone were obtained by the reaction between biotite and trimethylsilylating reagent. The soluble product which was formed at room temperature or at reflux temperature was a viscous liquid and was soluble in a wide range of organic solvents, but insoluble in water.
Kazuyuki Kuroda, Chuzo Kato
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Mineralogical Magazine, 1982
AbstractGreen biotite-like material occurring in Haast Schist at Brighton, eastern Otago, consists of biotite and a kaolin-group mineral interlayered on a 1 μm scale. Electron probe analyses of composite grains show K2O contents of 4.4 to 8.5 wt.%, in part reflecting the kaolin content, and in part, leaching of K+ ions.
D. Craw, D. S. Coombs, Y. Kawachi
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AbstractGreen biotite-like material occurring in Haast Schist at Brighton, eastern Otago, consists of biotite and a kaolin-group mineral interlayered on a 1 μm scale. Electron probe analyses of composite grains show K2O contents of 4.4 to 8.5 wt.%, in part reflecting the kaolin content, and in part, leaching of K+ ions.
D. Craw, D. S. Coombs, Y. Kawachi
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Experimental Conversion of Biotite to Hydrobiotite
Nature, 1970THE weathering of biotite in the soil frequently leads to replacement of interlayer K+ by hydrated Mg2+, with accompanying structural expansion along the c crystallographic axis from 10 to 14 A (ref. 1). Usually, the 14 A vermiculite phase becomes established without the development of well-defined intermediate spacings on the X-ray diffraction pattern.
V C, Farmer, M J, Wilson
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Contributions to Mineralogy and Petrology, 1995
Barium-, Cl- and Ti-rich biotite occurs together with garnet, plagioclase and amphibole within narrow shear zones in 1800 Ma old noritic granulites in the Flakstadoy Basic Complex, Lofoten, north Norway. The granulite facies assemblage, plagioclase, clinopyroxene, orthopyroxene, biotite and ilmenite, was replaced by an amphibolite facies mineral ...
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Barium-, Cl- and Ti-rich biotite occurs together with garnet, plagioclase and amphibole within narrow shear zones in 1800 Ma old noritic granulites in the Flakstadoy Basic Complex, Lofoten, north Norway. The granulite facies assemblage, plagioclase, clinopyroxene, orthopyroxene, biotite and ilmenite, was replaced by an amphibolite facies mineral ...
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Earth and Planetary Science Letters, 2006
Abstract We report Mossbauer spectra, magnetic hysteresis, acquisition and demagnetization of isothermal remanent magnetization (IRM), and low-temperature IRM warming curves of biotite crystals, as well as a summary of domain observations on magnetic extracts.
David J. Dunlop +2 more
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Abstract We report Mossbauer spectra, magnetic hysteresis, acquisition and demagnetization of isothermal remanent magnetization (IRM), and low-temperature IRM warming curves of biotite crystals, as well as a summary of domain observations on magnetic extracts.
David J. Dunlop +2 more
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Contributions to Mineralogy and Petrology, 2003
Stability of phengite and biotite in eclogite is discussed using petrological data of natural eclogites, and the observational data are examined by thermodynamic calculations. Generally, phengite is a major K phase in natural eclogite and is stable in wide range of bulk composition.
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Stability of phengite and biotite in eclogite is discussed using petrological data of natural eclogites, and the observational data are examined by thermodynamic calculations. Generally, phengite is a major K phase in natural eclogite and is stable in wide range of bulk composition.
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The biotite-prehnite association
Lithos, 1975Abstract Prehnite interleaved with biotite in altered diorite from S.E. Queensland and elsewhere has a lens-shaped form which bows the enclosing mica cleavages. Despite the first description of the texture in 1918 and identification of the prehnite in 1936 only a few references to the intergrowth can be found. Genetic considerations usually involve K
Evan R. Phillips, Peter C. Rickwood
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