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Hydrothermal Alteration of a Serpentinite Near Takovo, Yugoslavia, to Chromium-Bearing Illite/Smectite, Kaolinite, Tosudite, and Halloysite
Cr-halloysite Cr-illite/smectite Cr-kaolinite Cr-tosudite Hydrothermal Serpentinite
2012/2/9
Hydrothermal alteration products of serpentinite near Takovo, Yugoslavia, were studied by X-ray powder diffraction and chemical analysis. A zone of mainly blue clays adjacent to the hydrothermal vein ...
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...
Cristobalite Morphology and Oxygen Isotopic Composition Variation under Hydrothermal Alteration
Cristobalite Morphology Oxygen Isotopic Composition Variation Hydrothermal Alteration
2011/11/18
Abstract: From 2 to 28% opal-cristobalite was isolated from the 2–20 µm fraction of rhyolitic and andesitic tuffaceous pyroclastics from the Island of Honshu, Japan, where it had been formed in ...
Experimental Alteration of a Chlorite into a Regularly Interstratified Chlorite-Vermiculite by Chemical Oxidation
Chlorite Chlorite-Vermiculite Chemical Oxidation
2012/2/13
A IIb orthochlorite (brunsvigite), from the chloritic metabasalt in the Middletown Valley of Maryland, was altered to a regularly interstratified chlorite—vermiculite after four months reaction in sat...
Natural Alteration of Mica and Reactions between Released Ions in Mineral Deposits
Natural Alteration Mica Released Ions Mineral Deposits
2012/2/14
Chemical changes during the natural alteration of micas were studied by electron microprobe and classical chemical analyses of fresh and altered portions of mica flakes from 10 Canadian mineral deposi...
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...
The Alteration of Some Aromatic Amino Acids and Polyhydric Phenols by Clay Minerals
Aromatic Amino Acids Alteration Polyhydric Phenols Clay Minerals
2012/2/15
These studies concern the catalytic activity of clays on amino acids, particularly tyrosine. Polyhydric phenols were included to help understand the tyrosine reactions.Below pH 3, tyrosine is adsorbed...
The Alteration Products of Potassium Depleted Oxybiotite
Alteration Products Potassium Oxybiotite
2012/2/15
Artificial weathering of biotites, which contain various levels of structural ferric iron, by NaCl and NaBPh4 solutions produces minerals and structures similar to those described for naturally weathe...
Artificial alteration of thirty-five trioctahedral and one dioctahedral micas by solutions varying in strength from 0·001 to 1·00 molal magnesium sulfate was found to approximate a normal exchange rea...
A Comparative Study of the Diagenetic Alteration of Clay Minerals in Mesozoic Shales from Papua, New Guinea, and in Tertiary Shales from Louisiana, U.S.A.
Diagenetic Alteration Clay Minerals Mesozoic Shales
2011/11/17
Abstract: Gradual change from 60% montmorillonite/40% illite randomly interstratified clay minerals at 3500 ft depth to 20% montmorillonite/80% illite at 10,200 ft can be observed in a complete sectio...
Sequential Active Alteration of Rhyolitic Volcanic Rock to Endellite and a Precursor Phase of It at a Spring in Michoacan, Mexico
Sequential Active Alteration Rhyolitic Volcanic Endellite Precursor Phase
2012/2/20
Sequential alteration of volcanic rock of rhyolitic composition to a precursor of endellite, and thence to tubular endellite, may be observed at a hot spring about 27 km north of Ciudad Hidalgo, Micho...
Flint Clay by Hydrothermal Alteration of Sedimentary Rock in Mexico
Flint Clay Hydrothermal Alteration Sedimentary Rock Mexico
2012/2/20
This paper documents the first report of flint clay in Mexico, located at Estola, Guerrero, 199 km south of Mexico City, on Mexico Highway 95. It is the first report (known to the writers) of flint cl...
The composition and physical properties of three clay soils were altered by introducing aluminum under an electro-chemical gradient in order to evaluate the role of pH in controlling changes in soil c...
Hydrothermal Alteration of a Rhyolite Flow Breccia near San Luis Potosi, Mexico, to Refractory Kaolin
Hydrothermal Alteration Rhyolite Flow Breccia San Luis Potosi Refractory Kaolin
2012/2/21
A deposit of kaolin clay, the site of the General Zaragosa Mine, located about 50 km northwest of San Luis Potosi, S. L. P., Mexico, has produced more than 250,000 tons of refractory clay by room and ...