Results 101 to 110 of about 314 (124)

Stilbite-laumontite equilibrium

Contributions to Mineralogy and Petrology, 1971
The reaction stilbite=laumontite+3 quartz+3 H2O was experimentally studied using conventional hydrothermal techniques employing mineral mixtures consisting of reactants and products in 9∶1 and 1∶9 ratios. Equilibrium was demonstrated; the univariant curve passes through about 170° C and 2000 bars, 185°±10° C and 3000 bars, about 185° C and 4000 bars ...
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The relation of stellerite and epidesmine to stilbite

Mineralogical Magazine and Journal of the Mineralogical Society, 1939
The recent finding of a stellerite-like mineral in California has led to this study of its relations to epidesmine and stilbite. The mineral was found by Mr. Allen Nichol, mineralogist of the Division of Highways, in the quarry of the Calavera Materials Company near Oceanside, San Diego County.
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Microporous Stilbite single crystals for alcohol sensing

Journal of Electroceramics, 2006
The possibility of shape-selective resistive gas sensors for polar molecules using the microporous alumo-silicate Stilbite is investigated. The electrical impedance of natural Stilbite single crystals at 80°C decreases in presence of methanol, 2-propanol and 3-pentanol, but increases with increasing water and neo-pentanol vapour pressure.
Schäf, O., Wernert, V., Ghobarkar, H., Knauth, P.   +3 more
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Solid solutions of stilbite and epistilbite

Inorganic Materials, 2015
Analysis of the empirical compositions of stilbite-Ca and epistilbite from various occurrences has shown that these solid solutions differ primarily in the mole fraction of water in their compositions. A comparative analysis of different structural models of stilbite (C2/m, F 2/m (42℃), and Amma (168℃)) revealed no fundamental distinctions between the ...
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Thermochemical study of calcium zeolites—heulandite and stilbite

American Mineralogist, 2001
Calorimetric measurements were made on natural samples of heulandite having the composition Ca0.86Na0.37K0.06Al2.14Si6.86O18·6.1H2O and stilbite Ca1.01Na0.12Al2.12Si6.88O18·7.27H2O both from the same locality (Nidym River, E. Siberia, Russia). Enthalpies of formation and hydration were studied by calorimetry in lead borate solvent at 975 K.
I. Kiseleva, A. Navrotsky, I. Belitsky, B. Fursenko   +3 more
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2. Stilbite, from Kerguelen's Island

Proceedings of the Royal Society of Edinburgh, 1882
I am indebted to the kindness of my friend Mr J. Y. Buchanan, M.A., the chemist and physicist to the “Challenger” expedition for the specimen which forms the subject of this note.In speaking of the geology of Kerguelen Island, Mr Buchanan thus describes the occurrence of this zeolite (vide Proc. Roy. Soc., vol. xxiv. p.
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Thermal Behaviour and Adsorption Properties of Natural Stilbite

Journal of inclusion phenomena and molecular recognition in chemistry, 1997
Crystals collected from the Ellora valley(Aurangabad, MS, India) of the Deccan traps of India have beencharacterized as a stilbite (St) by X-ray diffraction, IRspectroscopy and chemical analyses. The thermal behaviour was studiedusing TG and DTA techniques. The sample was exchanged at refluxtemperature with NH4Cl and NH4St was prepared.
M. W. Kasture, S. P. Mirajkar, V. V. Joshi, A. L. Choudhari, V. P. Shiralkar   +4 more
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Stellerite and Stilbite from Pennsylvania Trap Rocks

Rocks & Minerals, 2019
In the late Triassic to early Jurassic, about 220 million years ago, North America began to separate from Africa and Europe as the ancient supercontinent of Pangea broke up and the Atlantic Ocean f...
Peter B. Leavens, Sharon Fitzgerald, Joseph P. Smith   +2 more
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ChemInform Abstract: New Zeolite Derivatives of Stilbite.

ChemInform, 1988
AbstractThe natural zeolitic mineral stilbite and its Ag(I) exchanged form are tested for their suitability as cation exchangers and as adsorbents for CO2, H2S, and NH3.
N. SINGHAI, S. P. BANERJEE
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Sorption and diffusion of rare gases in heulandite and stilbite

Surface Science, 1969
Abstract With a view to establishing the potentiality of heulandite and stilbite as sorbents and encapsulating media for gases, the uptake of Ne, Ar and Kr in these zeolites has been studied at pressures up to 10000 p.s.i. and at relatively elevated temperatures.
R.M. Barrer, D.E.W. Vaughan
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