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Occurrence of Spherical Halloysite in Bituminous Coals of the Sydney Basin, Australia
Coal Energy-dispersive X-ray spectroscopy Halloysite Morphology Sphere Transmission electron microscopy
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2012/1/4
Spherical halloysite aggregates have been identified for the first time in mineral matter isolated from bituminous coals. The spherules, found in Permian coals of the Sydney basin, New South Wales, ra...
Thermal Stability of Halloysite by High-Pressure Differential Thermal Analysis
Dehydroxylation Halloysite High-pressure differential thermal analysis Morphology Phase relations Thermal stability
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2012/1/4
Platy (Te Puke, New Zealand), cylindrical (Spruce Pine, North Carolina), and spherical (North Gardiner mine, Huron, Lawrence County, Indiana) halloysite samples were analyzed by high-pressure differen...
Aqueous-Chemical Control of the Tetrahedral-Aluminum Content of Quartz, Halloysite, and other Low-Temperature Silicates
Activity diagram Al solid solution Crystal morphology Halloysite Quartz Step function Water-silicate equilibria
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2012/1/5
Aqueous Al passes from octahedral to tetrahedral coordination over a narrow pH interval, or threshold. This interval is 5.5–6.5 at 25°C and shifts to lower pH as temperature increases. The concentrati...
Dehydration of Synthetic Hydrated Kaolinites: A Model for the Dehydration of Halloysite(10A)
Dehydration Halloysite Hydrite Kaolinite Water
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2012/2/2
Several hydrates can be synthesized from well-crystallized kaolinites; of importance to the present work are a 10-Å hydrate (called the QS-10 hydrate), an 8.6-Å hydrate, and two kinds of p...
Comparison of Intercalation Methods for Differentiating Halloysite from Kaolinite
Formamide Halloysite Hydrazine Intercalation Kaolinite Potassium acetate Test
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2012/2/6
The intercalation of formamide, potassium acetate, and hydrazine by halloysite and/or kaolinite-rich samples, with and without subsequent displacement of the interlayer species by water or glycerol/wa...
Intercalation Method Using Formamide for Differentiating Halloysite from Kaolinite
Formamide Halloysite Intercalation Kaolinite N-methylformamide Test
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2012/2/6
A rapid and simple test to distinguish halloysite from kaolinite in mineral mixtures has been developed based on differences in the rate and extent of formamide intercalation. With halloysite, complex...
Surface Properties of Allophane, Halloysite, and Imogolite
Adsorption Allophane Halloysite Imogolite Infrared spectroscopy Phosphate Surface charge
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2012/2/7
The adsorption of sodium, chloride, and phosphate ions by allophane, imogolite, and halloysite has been studied in relation to the surface structure of the mineral samples. The high adsorption of phos...
Morphology and Structure of Halloysite in New Zealand Tephras
Crystal dislocations Electron microscopy Growth mechanisms Halloysite Morphology
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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...
Selective Adsorption of Zinc on Halloysite
Adsorption Cation exchange Halloysite Selectivity Zinc
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2012/2/9
Zn- and Ca-adsorption equilibria of five Ca-saturated halloysite samples were measured at equilibrium Zn concentrations up to 10−2 M in 10−4 to 10−2 M CaCl2. The results were interpr...
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
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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 ...
Synthesis of the Trimethylsilylation Derivative of Halloysite
Halloysite Kaolinite Synthesis Trimethylsilylation
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2011/11/18
Abstract: The trimethylsilyl derivative from halloysite was prepared by the reaction of halloysite powder with a trimethylsilylating reagent. The product was organophilic and the results of its infrar...
Observation of the Hydrated Form of Tubular Halloysite by an Electron Microscope Equipped with an Environmental Cell
Dehydration Diffraction Halloysite Kaolinite Tubular
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2011/11/18
Abstract: The hydrated form of tubular halloysite [halloysite (10 Å)] was observed by a conventional electron microscope equipped with an environmental cell (E.C.), by which the “natural” form w...
Intercalation of Salts in Halloysite
Halloysite Intercalation Interlayer Kaolinite
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2012/2/10
Several new salt intercalation complexes of halloysite have been prepared and characterized using X-ray powder diffraction techniques taking into account both the position and the shape of the d001 pe...
Mineralogy and Geology of the Maungaparerua Halloysite Deposit in New Zealand
Mineralogy Geology Maungaparerua Halloysite Deposit New Zealand
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2011/11/18
Abstract: The Maungaparerua halloysite deposit is located on the North Island of New Zealand some 210 km north of Auckland. The halloysite deposit was formed by hydrothermal alteration of rhyolite flo...
Note on the Intercalation of Kaolinite, Dickite and Halloysite by Dimethyl-Sulfoxide
Kaolinite Dickite Halloysite Dimethyl-Sulfoxide
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2012/2/13
Various kaolinites, a dickite and halloysites have been treated by DMSO in presence of D2O and subsequently washed by D2O. This procedure allowed to record OD stretching bands which are due specifical...