Results 201 to 210 of about 16,574 (254)

Mössbauer effect in biotite

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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Trimethylsilylation of Biotite

Clays and Clay Minerals, 1977
AbstractOrganic 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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Interlayered biotite-kaolin and other altered biotites, and their relevance to the biotite isograd in eastern Otago, New Zealand

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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Experimental Conversion of Biotite to Hydrobiotite

Nature, 1970
THE 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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Magnetism of biotite crystals

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, Özden Özdemir, Denis G. Rancourt   +2 more
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Chlorine, titanium and barium-rich biotites: factors controlling biotite composition and the implications for garnet-biotite geothermometry

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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Stability of phengite and biotite in eclogites and characteristics of biotite- or orthopyroxene-bearing eclogites

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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The biotite-prehnite association

Lithos, 1975
Abstract 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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Biotite from rapakivi

Mineralogy and Petrology, 1994
This paper deals with the chemical composition of biotites from rapakivi granites. For this purpose, 61 chemical analyses of biotites from composite anorthosite-rapakivi plutons in the Fennoscandian and Ukranian shields were used. Figurative points of the biotite composition were plotted on diagrams designed for biotites byFoster (1960),Winchell (1949)
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The decomposition of biotite in the soil

Mineralogical Magazine and Journal of the Mineralogical Society, 1949
A noticeable feature of many of the soils of north-east Scotland is the presence in them of glistening yellow flakes of decomposed biotite. The light-reflecting property of this material catches the eye even though the flakes themselves are often of very small size.An analogous process to the breakdown of biotite as reported below occurs in the soil ...
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