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Formation of Trioctahedral Illite from Biotite in a Soil Profile Over Granite Gneiss
Biotite Electron microprobe Illite Mica Scanning electron microscopy Trioctahedral Weathering X-ray powder diffraction
2012/1/4
Clay fractions separated from the A2, B, and C horizons of a soil formed on granite gneiss showed X-ray powder diffraction (XRD) spacings characteristic of trioctahedral illite. The trioctahedral illi...
Layer-Charge and Cation-Exchange Characteristics of Vermiculite (Weathered Biotite) Isolated from a Gray Luvisol in Northeastern Saskatchewan
Alkylammonium Biotite Cation exchange Layer charge Tilt angle Transmission electron microscopy Vermiculite X-ray powder diffraction
2012/1/5
Layer charge and cation-exchange characteristics of weathered biotite isolated from a Gray Luvisol in Saskatchewan showed that this product was a high-charge vermiculite. Cation-exchange capacity (CEC...
Sorption of Uranium and Radium by Biotite, Muscovite, and Phlogopite
Anion exchange Biotite Cation exchange Muscovite Phlogopite Radium Sorption Uranium
2012/2/7
The sorption of U and Ra on finely ground biotite, muscovite, and phlogopite was adequately described by the Freundlich adsorption equation, (x/m) = KCn, at low U and Ra concentrations despite Ra prec...
Catalytic Action of Copper on the Oxidation of Structural Iron in Vermiculitized Biotite
Biotite Catalyst Copper Iron Oxidation Vermiculite
2012/2/7
The ferrous iron content of two vermiculitized biotites decreased by treatment with 0.1 N salts of copper at 70°C from 9.1–14% to 1.8–2.6%. Presumably, interlayer copper ions acted as a catalyst (here...
Geochemistry of Hydrothermal Chlorite Replacing Igneous Biotite
Aluminum conservative alteration Biotite Chlorite Electron probe analysis Fluid inclusions Hydrothermal alteration Isovolumetric alteration
2012/2/7
Hydrothermal chlorite replaces igneous biotite in the Gold Hill, Utah, quartz monzonite. Chemical compositions of coexisting biotite and chlorite determined by electron microprobe and wet chemical met...
Mossbauer, Thermomagnetic, and X-Ray Study of Cation Ordering and High-Temperature Decomposition in Biotite
Biotite Ferrispinel Mossbauer spectra Oxybiotite Thermal decomposition Thermomagnetism
2012/2/9
To explain the large values of the quadrupole splittings and line widths in the M鰏sbauer spectrum of oxybiotite, a formalized analysis of the distribution of effective charges in the anion network was...
Biotite Alteration in Deeply Weathered Granite. II. The Oriented Growth of Secondary Minerals
Biotite Electron diffraction Goethite Orientation Vermiculite Weathering products
2012/2/10
Single grain X-ray and electron diffraction patterns of weathered biotite flakes exhibit groupings of 001 and hk reflections of biotite, vermiculite, mixed-layer clay minerals, and kaolinite indicatin...
Biotite Alteration in Deeply Weathered Granite. I. Morphological, Mineralogical, and Chemical Properties
Biotite Goethite Mixed-layer mineral SEM morphology Vermiculite Weathering
2012/2/10
Biotite in deeply weathered granitic rocks in southwestern Australia has altered to exfoliated grains composed of biotite, mixed-layer clay minerals, kaolinite, vermiculite, gibbsite, goethite, and he...
Organic 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...
Effect of Oxidation and Reduction on Potassium Exchange of Biotite
Oxidation Reduction Potassium Exchange Biotite
2012/2/15
The selectivity of K over Ca of Amelia biotite increased sharply upon oxidation by H2O2 at pH 6·0. This increase in K selectivity was only partially reversible upon reduction by Na2S2O4. Oxidation by ...
Artificial Alteration of Biotite into a 14 A Layer Silicate with Hydroxy-Aluminium Interlayers
Artificial Alteration Biotite 14 A Layer Silicate Hydroxy-Aluminium Interlayers
2012/2/15
Biotite was altered by boiling in 0·2 M AlCl3 solution, and the products were examined by X-ray powder and single-crystal diffraction, chemical analysis and thermogravimetry. The altered material is a...
Magnetic Behavior of Some Biotite Samples from West Thrace, N.E. Greece
Magnetic Behavior Biotite Samples West Thrace
2012/2/15
The magnetic behavior of some biotite samples, from volcanic rocks of W. Thrace area, N.E. Greece, was studied in the temperature range from 85 to 270°K and compared with the chemical composition. The...
Oxidation of octahedral ferrous iron in biotite by saturated bromine water results in a loss of both octahedral and interlayer cations. The hydroxyl adjacent to vacant octahedral cation sites adopt an...