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Linear programming problems for Na-Al-Si-O-H system have been formulated and solved for calculations of standard enthalpies and Gibbs potentials of zeolites with unknown thermodynamic properties. The ...
Decolorization of an anthraquinone dye, Reactive Brilliant Blue KN-R by hydrogen peroxide was examined using Fe-containing Y and ZSM-5 zeolites as heterogeneous catalysts. Catalysts were prepared by i...
Abstract: The level of Fe impurities in 2 well-crystallized kaolinites was modified (by addition or chemical removal treatment) to analyze the Fe influence in the aluminosilicate zeolite synthesis.The...
The solubilities of analcime and clinoptilolite were determined in dilute, weakly alkaline,aqueous solutions below 300 8 C and at vapor-saturated pressures. Analcimes used in this study were from Mont...
This study clarifies the crystal structure variations and relationships in the zeolites eri-onite and offretite. The crystal structure analyses used Rietveld analysis of X-ray powder diffraction data,...
Many known occurrences of the zeolites erionite and offretite have been characterized by electron probe microanalysis, X-ray powder diffraction, and optical microscopy. For the first time, a substanti...
Abstract: Sedimentary zeolites clinoptilolite, mordenite and erionite occur as diagenetic products of ash falls of rhyolitic composition from the Oligocene Chichindaro Formation at the limits of the M...
Thermodynamic properties ofthe natural calcium zeolites laumontite, leonhardite, de-hydrated leonhardite (metaleonhardite), wairakite, and yugawaralite werestudied bycal-orimetry in lead borate solven...
Pressure-induced amorphous-phase transitions (amorphization) have been observed in framework silicates like quartz and feldspars. Asimilar crystalline to highly disordered solid phase transition is re...
The vitric matrix of pre-caldera acid tuff and tuff breccia of the Santorini volcano, Aegean Sea, Greece has been generally replaced by one or more of the following authigenic minerals: K-rich and (K,...
Hypothetical model structures for magadiite and sodium octosilicate, based on the structure of the zeolite dachiardite, are proposed that consist of layers of 6-member rings of tetrahedra and blocks c...
Zeolites and associated minerals occur in a tholeiitic basaltic pillow lava sequence that makes up part of the Eocene Siletz River Volcanics in the central Coast Range, Oregon. Regional zoning of zeol...
Zeolites having the structures of phillipsite, merlinoite, and gobbinsite were synthesized from clear solutions at 80°C in the system Na2O-K2O-Al2O3-SiO2-H2O and their morphologies, cell parameters, a...
Clay minerals and zeolites, candidate backfill minerals for nuclear waste repositories, were treated with saturated NaCl brine and Mg-rich (Mg-Ca-Na-K) brine at 200∑C and 300∑C for 4 weeks under a con...

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