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The Dependence of Localized Crystallization of Halloysite and Kaolinite on Primary Minerals in the Weathering Profile of Granite
Biotite Granite Halloysite Kaolinite Weathering
2011/12/5
Abstract: The formation of kaolin-group minerals in the weathering profile of granite, under the humid, temperate climate as found in Korea, was studied by X-ray diffraction (XRD), scanning electron m...
Determination of Illite-Smectite Structures Using Multispecimen X-ray Diffraction Profile Fitting
Illite-Smectite Simulation Structure Swelling X-Ray Diffraction
2011/12/7
Abstract: A procedure for structural investigations by X-ray diffraction of mixed-layer structures incorporating swelling layers has been developed. For each sample, specimens saturated with different...
Characterization of Intercalated Smectites Using XRD Profile Analysis in the Low-Angle Region
Montmorillonite Profile Analysis Smectite XRD
2011/12/2
Abstract: X-ray diffraction (XRD) characterization of natural and intercalated smectites is usually limited to the apparent d-value estimated from the peak maxima in the raw data. This can lead to the...
Decomposition of Experimental X-ray Diffraction Patterns (Profile Fitting): A Convenient Way to Study Clay Minerals
Clay Minerals Decomposition Mixed Layering Simulation X-ray Powder Diffraction
2011/12/9
Abstract: This paper thoroughly describes the decomposition procedure, using the example of DECOMPXR (Lanson 1990). The steps of the decomposition procedure are: 1) preliminary data processing; 2) dec...
Crystallochemical Study of a Population of Particles in Smectites from a Lateritic Weathering Profile
Crystal-chemistry ESR FTIR Layer structural composition Mossbauer Nontronite Smectite Solid-solution
2011/12/31
In the copper deposit of Salobo 3A (Brazil), nontronite-like clay samples were found at the bottom of the weathering blanket. Samples were fractionated first by sedimentation and then by a HGMS method...
High-Resolution Transmission Electron Microscopy Study of Mn-Oxyhydroxide Transformations and Accompanying Phases in a Lateritic Profile of Moanda, Gabon
Energy-dispersive X-ray analysis Hausmannite High-resolution transmission electron microscopy Laterite Manganese Manganite Pyrolusite Topotactic transformation
2011/12/31
Unheated natural mixtures of manganite and secondary pyrolusite, from the same lateritic manganiferous sequence, were studied in different orientations by high-resolution transmission electron microsc...
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...
Natroalunite in a Laterite Profile Over Deccan Trap Basalts at Matanumad, Kutch, India
Alunite Kaolinite Laterite Natroalunite Oxidation Saprolite
2012/1/10
An end-member natroalunite of composition (K0.04Na0.96)(Al2.98Fe0.02)(SO4)2(OH)6 occurs in saprolitic clays in a laterite profile developed over Deccan Trap basalts at Matanumad in the Kutch region of...
Characterization of Goethite and Hematite in a Tunisian Soil Profile by Mossbauer Spectroscopy
Aluminum Goethite Hematite Iron Manganese Mossbauer spectroscopy Soil
2012/1/12
As part of the characterization of a Tunisian red soil profile, six samples, taken at different depths, were investigated by M鰏sbauer spectroscopy at room temperature and at 80 K to obtain information...
Hydrogen Atom Positions in Kaolinite by Neutron Profile Refinement
Crystal structure Hydrogen Kaolinite Neutron profile refinement O-H vector Rietveld method
2012/2/7
A structure refinement of kaolinite made using the Rietveld neutron profile refinement technique has given non-hydrogen atom positions which were not significantly different from those given by B. B. ...