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Crystal chemistry and IR spectroscopy of Cl- and SO4-bearing cancrinite-like minerals
Crystal chemistry IR spectroscopy Cl- SO4-bearing cancrinite-like minerals
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2012/4/6
CI-and S04-bearing cancrinite-like mineralsfrom Italian localities werestudied by meansofEPMA,X-raydiffraction, and IR spectroscopy to relate their chemicalcompo-sition, IR data, and structural featur...
Crystal chemistry and petrologic significance of Fe3+-rich phlogopite from the Tapira carbonatite complex, Brazil
Crystal chemistry petrologic significance Fe3+-rich phlogopite Tapira carbonatite complex Brazil
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2012/4/6
This contribution deals withthe crystal chemistry ofphlogopite and Fe3+-rich phlogo-pite from the Tapira alkaline-carbonatite complex (Brazil) to assess the petrological sig-nificance and genetic cond...
Mn crystal chemistry in pumpellyite: A resonant scattering powder diffraction Rietveld study using synchrotron radiation
Mn crystal chemistry pumpellyite scattering powder diffraction synchrotron radiation
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2012/4/5
The present study attempts to clarify the structural role of Mnin two pumpellyite specimens with the chemical formulas Ca7.so(Als.91Mn1.85Mg1.16Feo.37)Sill.s40s6-xOHx and Cas.12(AI7.99Mn3.41Mgo.71Feo....
High-pressure crystal chemistry of LiScSiO4: An olivine with nearly isotropic compression
High-pressure crystal chemistry LiScSiO4 isotropic compression
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2012/4/5
Single-crystalX-raydiffractiondatahavebeenobtained atseveralpressuresto 5.6GPa for synthetic LiScSi04olivine.Thebulkmodulusis 118:t I GPa,assuming K'=4.This
valueis smaller than that offorsterite bec...
Mechanism of Illitization of Bentonites in the Geothermal Field of Milos Island Greece: Evidence Based on Mineralogy, Chemistry, Particle Thickness and Morphology
Bentonite Hydrothermal alteration Illitization Illite/smectite Kaolinite Neoformation Ostwald ripening Solid state transformation
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2011/12/28
Hydrothermal alteration has caused illitization along a 40m vertical profile in the Tsantilis bentonite deposit, Eastern Milos, Greece which consists principally of a Wyoming-type montmorillonite and ...
Crystal Chemistry of Hydrous Iron Silicate Scale Deposits at the Salton Sea Geothermal Field
Crystal chemistry EXAFS Ferrihydrite Hisingerite Hydrous iron silicate Mossbauer NMR
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2011/12/28
The crystal chemistry of Fe-Si scales deposited from geothermal brines at Salton Sea, California, was studied by powder X-ray diffraction and spectroscopic techniques including infrared, 57Fe M鰏sbauer...
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
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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...
Effects of Solution Chemistry on the Hydrothermal Synthesis of Kaolinite
Effect of ions Hydrothermal synthesis Kaolinite Solution chemistry
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2012/1/4
The hydrothermal synthesis of kaolinite was examined in the Al2O3-SiO2-H2O system to study inhibitory effects of additional ions on the formation of kaolinite. Syntheses were carried out with amorphou...
Mineralogy, Chemistry, and Diagenesis of Tuffs in the Sucker Creek Formation (Miocene), Eastern Oregon
Clinoptilolite Diagenesis Opal-CT Smectite Tuff Zeolites
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2012/1/5
The lacustrine Sucker Creek Formation (Miocene) of eastern Oregon includes unaltered vitric tufts as well as tufts altered to the following diagenetic facies: (1) bentonite, (2) interbedded bentonite ...
Weathering of Basalt: Changes in Rock Chemistry and Mineralogy
Basalt Core-stone Element mobilization Goethite Halloysite Smectite Weathering
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2012/1/10
The weathering of eastern Australian basalts, sampled from the rounded, hard, core-stone to the rind of softer weathered material, has been examined by bulk chemical analyses, thin section petrography...
Chemistry of Detrital Biotites and their Phyllosilicate Intergrowths in Sandstones
Biotite Chemical analysis Chlorite Diagenesis Electron probe Illite Intergrowth
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2012/1/12
Microprobe analyses of optically homogeneous detrital biotites from sandstones of the Visingsö Group and the Dala Sandstone, Sweden, revealed a consistently low K content (generally <0.75 atom/fo...
Chemistry of Illite/Smectite and End-Member Illite
Bentonite Chemical composition Diagenesis Illite Illite/smectite Smectite
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2012/1/12
Chemical data from three different series of diagenetic illite/smectites (I/S), analyzed statistically by two regresion techniques, indicate that the content of fixed-K per illite layer is not constan...
Crystal Chemistry of Corrensite: A Review
Chemical composition Corrensite Mixed layer Smectite Statistical analysis Vermiculite
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2012/2/6
Statistical analyses of chemical data from the literature of corrensite minerals suggest a large compositional variability, more evident in octahedral than in tetrahedral coordination. Mg occupies 40–...
Origin of an Underclay as Revealed by Vertical Variations in Mineralogy and Chemistry
Acid leaching Coal Expandability Illite/smectite Mixed layer Underclay
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2012/2/8
Regular vertical variations in mineralogy and chemistry indicate that underclay beneath the Herrin (No. 6) coal in southwestern Illinois has undergone in situ alteration. Alteration resulted from the ...
Smectite to Illite Conversion Rates: Effects of Solution Chemistry
Hydrothermal Illite Mixed layer Reaction rate Silica dissolution Smectite
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2012/2/8
Mixed-layer illite/smectite (I/S) was formed by reacting the Chambers or Polkville montmorillonite hydrothermally at 270° and 350°C from several hours to more than 15 weeks. Reactions were conducted i...