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Refined Relationships between Chemical Composition of Dioctahedral Fine-Grained Mica Minerals and Their Infrared Spectra within the OH Stretching Region. Part I: Identification of the OH Stretching Bands
Celadonite Glauconite Illite IR Spectra Leucophyllite OH Stretching Frequency
2011/12/9
Abstract: A large and representative collection of clay-size dioctahedral mica minerals differing in their chemical compositions has been studied by infrared (IR) spectroscopy in the OH stretching vib...
Beryl stability in local hydrothermal and chemical environments in a mineralized granite
Beryl stability local hydrothermal chemical environments mineralized granite
2012/4/1
The temperature and chemistry of hydrothermal fluids control the breakdown and for-
mation of beryl in rocks of appropriate bulk composition. In rocks of the Triberg granitic
complex in the Schwarzw...
Effect of Time and Temperature on the Chemical Composition and Crystallization of Mixed Iron and Aluminum Species
Aluminum Crystallization Gibbsite Iron
2011/12/1
Abstract: We studied the influence of time ageing (up to 120 d at 50°C or 30d at 95°C) on the mineralogical and chemical composition of hydrolytic species of mixed aluminum and iron samples formed at ...
Hematite and Goethite from Duricrusts Developed by Lateritic Chemical Weathering of Precambrian Banded Iron Formations, Minas Gerais, Brazil
Hematite Goethite Laterite Mossbauer Spectrometry
2011/12/1
Abstract: The upper 15–20 m of a 200 m thick lateritic weathering profile on Precambrian itabirites of Capanema, Brazil, reveals a genetic pathway for the formation of hematitic and goethitic nodules ...
Morphological and Chemical Features of Bioweathered Granitic Biotite Induced by Lichen Activity
Aspicilia intermutans Biotite Bioweathering Granite Lichens Parmelia conspersa
2011/12/27
To study the physico-chemical activity of lichens on micaceous components of granitic rocks, samples covered by thalli of Parmelia conspersa (Ehrht) Ach. and Aspicilia intermutans (Nyl.) Arn. were col...
Weathering of Chlorite in a Quartz-Chlorite Schist: I. Mineralogical and Chemical Changes
Alteration Chlorite Kaolinite Uranium Ore Deposit Vermiculite Weathering
2011/12/23
Abstract: The weathering of chlorite, one of the major minerals of the host rock in the uranium ore deposit at Koongarra, Australia, was examined by X-ray diffraction (XRD) analysis, scanning electron...
Simultaneous Mineralogical Quantification and Chemical Characterization of Soil Clays
Chemistry Illite Mass-balance Protoillite Quantify Smectite
2011/12/29
A new chemical mass balance technique has been developed for simultaneous mineralogical quantification and chemical characterization of soil clays. The procedure includes separation of the whole clay ...
Acid Activation of a Ferrous Saponite (Griffithite): Physico-Chemical Characterization and Surface Area of the Products Obtained
Acid activation Ferrous saponite Free silica Surface area
2011/12/29
A ferrous saponite (griffithite) from Griffith Park (California, USA) was treated with solutions of HCl (0.62, 1.25 and 2.5% by weight) at 25°C for 2, 6, 24 and 48 hours. The resulting solids were cha...
A Chemical, XRD, and 27Al MAS NMR Investigation of Miocene Gulf Coast Shales with Application to Understanding Illite/Smectite Crystal-Chemistry
Burial diagenesis Gulf Coast Illite/smectite Miocene NMR
2011/12/30
This study assesses the distribution of Al and Fe in mixed-layer illite/smectites (I/S) in shales undergoing burial diagenetic changes, using evidence from 27Al NMR, XRD, and chemical analyses. Sample...
The Chemical Form of Vanadium (IV) in Kaolinite
Electron paramagnetic resonance Isomorphic substitution Kaolinite Vanadium
2011/12/30
A combined application of electron paramagnetic resonance (EPR) and Fourier-transform infrared (FTIR) spectroscopies with thermal methods was used to determine the chemical form of V(IV) in a Georgia ...
Analyses of Palygorskites and Associated Clays from the Jbel Rhassoul (Morocco): Chemical Characteristics and Origin of Formation
AEM Jbel Rhassoul Neoformation Palygorskite
2011/12/30
The 揊ormation Rouge?from the Jbel Rhassoul in Morocco is composed of detrital sediments which have a lacustrine origin. The clays contained in the less than 2 祄 fraction of the sediments are detrital ...
Effects of Acidification on the Chemical Composition and Layer Charge of Smectite from Calcareous Till
Layer charge Smectite Soil acidity Structural formula Weathering
2011/12/31
The objectives of the study were to determine the chemical composition and layer charge of smectite found in calcareous till of the Interior Plains region of western Canada and to examine the effects ...
Diagenetic Illite-Chlorite Assemblages in Arenites. I. Chemical Evolution
ATEM Chlorite EDS Illite
2011/12/31
Authigenic chlorites and illites coexisting in clastic reservoir sandstones have been studied by energy dispersive X-ray spectroscopy (EDS) in the transmission electron microscope (TEM). All 16 sample...
Chemical Characterization, Structural Features, and Thermal Behavior of Sodium and Hydrogen Octosilicate
Octosilicate Sheet silicates MAS-NMR spectroscopy Thermal behavior
2012/1/4
The chemical composition and the thermal behavior of sodium and hydrogen octosilicate was studied by chemical and thermal analysis, infrared (IR), magic-angle-spinning nuclear magnetic resonance (MAS-...
Morphological, Chemical, and Isotopic Evidence for an Early Diagenetic Evolution of Detrital Smectite in Marine Sediments
Chemical composition Diagenesis Isotopic composition Morphology Smectite Transmission electron microscopy X-ray powder diffraction
2011/11/30
Abstract: Mineralogical (XRD), morphological (transmission electron microscopy), chemical (major, rare-earth elements, and scanning-transmission electron microscopy), and isotope (Sr, O, H) measuremen...