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A natural mineral, palygorskite clay, was used to synthesize pure zeolite X via a two-stage method. The synthetic parameters, such as calcination, crystallization time, and SiO2/Al2O3 molar ratio, wer...
Abstract: X-ray phase analysis of clays is difficult because these materials generally consist of a mixture of different phases, i.e., mixed-layer minerals, individual clay minerals (non mixed-layer),...
Abstract: Mining operations during the early 1990s at Uley Graphite Mine near Port Lincoln on southern Eyre Peninsula, South Australia, uncovered abundant nontronite veins in deeply weathered granulit...
Chromian clinochlore-IIb-4 (triclinic) and IIb-2 (monoclinic) polytypes from the Day Book Body, North Carolina, were heated to 650 ?C for 5 hours and air quenched. Single-crystal X-ray refinements o...
Thesolubilityofatwo-component,H O CO ?uidinsilicateliquidswasmodeledby assumingmechanical,thermal,andchemicalequilibriumbetweenthe?uidandliquidphas- H O CO ) es.Theliquidphasewastreatedasa12-compone...
Thispaperpresentshigh-resolutionsynchrotronX-raypowderdiffractiondataat290K ontwoFe-bearing,polycrystallinesilicateperovskitesampleswithapproximatecompo- Fe )SiO synthesizedat25GPaand1920Kinamulti-a...
Microorganisms can accelerate the rate of Mn21 oxidation by up to five orders of mag-nitude compared to abiotic Mn21 oxidation. Mn21 oxidation in Pseudomonas putida strain GB-1 involves an enzyme inco...
Theyoungestsamplehasparameterscorrespondingtonearlyunoxidizedtitanomagne- tite,whereastheoldestisnear-end-membertitanomaghemite.Intermediatesamplesare partiallyalteredbutdisplaynosuperstructurere?ec...
Mueller'smodelhasbeenwidelyapplied to modelingkineticexperimental data onthe ordering-disordering ofcations betweentwo nonequivalent sites.Thismodelis validonly for pure ornearly purebinary systems. F...
Melting of NaCl and MgOhas been simulated witha two-phase molecular dynamics method at constant pressure using newly developed interaction potentials. Equations of state for NaCl and MgOsimulated by m...
A new, well-ordered, thermally robust ethylene glycol intercalate of kaolinite was formed by refluxing the dimethyl sulfoxide intercalate of kaolinite (Kao-DMSO) with dry ethylene glycol (EG). This ne...
Samples from initially smectite-rich Tertiary continental volcaniclastic sediment from the Deer Lodge and Big Hole basins of southwestern Montana show a general decrease in illite/smectite (I/S) expan...
A high-charge smectite from Arizona [cation-exchange capacity (CEC) = 120 meq/100 g] and a low-charge smectite from Wyoming (CEC = 90 meq/100 g) were used to prepare homoionic tetramethylammonium (TMA...
Fifteen iron oxide accumulations from the bottoms of two Finnish lakes (搇ake ores? were found to contain as much as 50% Fe. Differential X-ray powder diffraction and selective dissolution by oxalate s...

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