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Small-Angle X-Ray Powder Diffraction, Morphology, and Structure of Allophane and Imogolite
Allophane Dehydroxylation Imogolite Infrared spectroscopy Morphology Small angle scattering
2012/2/1
Small-angle X-ray powder diffraction analyses and high-resolution electron microscopy of allophane samples (SiO2/Al2O3 ratio, 1.12 to 1.68) showed that allophanes consist of nearly identical spherical...
Morphology of Nordstrandite
Carboxylic acid Electron diffraction Electron microscopy Montmorillonite Morphology Nordstrandite Synthesis
2012/2/8
Nordstrandite was obtained synthetically by precipitation of Al(OH)3 at pH 9.0 to 11.0 in citrate or malate systems with Al: carboxylic acid molar ratios of 10?00 in the absence and in the presence of...
Morphology and Structure of Halloysite in New Zealand Tephras
Crystal dislocations Electron microscopy Growth mechanisms Halloysite Morphology
2011/11/22
Abstract: As shown by scanning and transmission electron microscopy, halloysite in three rhyolitic tephras occurs as squat and elongate ellipsoids. Both morphologies are presumed to result from a simi...
Scanning Electron Microscope Morphology of Deeply Weathered Granite
Feldspar Gibbsite Granite Halloysite Kaolinite Scanning electron microscopy Weathering
2011/11/22
Abstract: Laterite profiles developed from granite in southwestern Australia were studied by scanning electron microscopy. The morphology of soil materials reflects the mineralogy of secondary mineral...
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 ...
A Study of the Morphology and Properties of Aryl and Alkyl Ammonium Montmorillonites: An Electron Microscope Investigation
Properties Aryl Alkyl Ammonium Montmorillonites Electron Microscope Investigation
2012/2/13
The effect of exchanging selected aryl and alkyl ammonium cations for sodium ions on the morphology and the hydrophobicity of a sodium montmorillonite was studied. It was found that the morphology of ...
Internal and External Morphology of Tubular and Spheroidal Halloysite Particles
External Morphology of Tubular Spheroidal Halloysite Particles
2011/11/18
Abstract: Tubular halloysite from Wagon Wheel Gap, Colorado and spheroidal halloysite from Redwood County, Minnesota were examined by transmission electron microscopy. Clay samples were prepared by th...
Morphology of Particles in Size-Fractionated Na- Montmorillonites
Morphology Particles Size-Fractionated Na Montmorillonites
2012/2/21
Electron microscopy of particles in size fractions (0??? ? 0??? ? 0?5?? ?and < 0?5 ?e.s.d.) obtained by centrifugation of Na-saturated montmorillonites from Wyoming (two samples); Chambers, Arizona; a...
Glauconite Pellets: Similar X-Ray Patterns from Individual Pellets of Lobate and Vermiform Morphology
Glauconite Pellets Similar X-Ray Patterns Individual Pellets Lobate Vermiform Morphology
2012/2/21
Glauconite pellets of vermiform and lobate morphology occur together in Eocene geologic formations in Maryland. Morphologically, the vermiform pellets appear to be identical to those that have previou...