Results 161 to 170 of about 688 (199)

Studies of MnS cluster formation in laumontite zeolite

Surface Science, 2006
Abstract MnS clusters were prepared by treating laumontite zeolite with 0.1 N aqueous manganese nitrate solutions at 296 K (pH 5.8), using a solid/liquid ratio of 1/50, followed by a sulfidation process with H2S, at 350 K, during 12 h. XRD and magnetic resonance measurements proved that the clusters are formed inside the zeolite channels. Examination
Felicia Iacomi
exaly   +2 more sources

An X-ray single crystal study of alkaline cations influence on laumontite hydration ability: I. Humidity-induced hydration of Na,K-rich laumontite

Microporous and Mesoporous Materials, 2012
Abstract In the present work the influence of alkaline cations on pressure behavior of laumontite |(Ca4−xNax)Kx(H2O)n|[Al8Si16O48] was studied using single-crystal X-ray diffraction in diamond-anvil cell with water medium. Na,K-rich laumontite, containing 13.4 H2O molecules per formula at ambient pressure (0.0001 GPa), hydrates up to ≈15.5 H2O in the
Yurii Seryotkin, Sergey Rashchenko
exaly   +2 more sources

Laumontite

, 2001
M.M.J. Treacy, J.B. Higgins, John B. Higgins   +2 more
openaire   +2 more sources

Laumontite

, 2007
M.M.J. Treacy, J.B. Higgins
openaire   +2 more sources

Fully hydrated laumontite: A structure study by flat-plate and capillary powder diffraction techniques

Zeolites, 1993
The structure refinement of laumontite [Ca4Si16Al8O48.18 H2O; Z= 1, CuKalpha radiation; T = 295 K; cell a = 14.845(9), b = 13.167(2), c = 7.5414(8) angstrom; beta = 110.34(2)-degrees, C2/m, D(x) = 2.306, M(r) = 1917.80] was completed from X-ray powder ...
Kenny Stahl, Gilberto Artioli
exaly   +2 more sources

The dissolution of laumontite in acidic aqueous solutions: A controlled-temperature in situ atomic force microscopy study

American Mineralogist, 2012
The behavior of the zeolite laumontite during dissolution in acidic aqueous solutions has been studied by fluid-cell atomic force microscopy, with a focus on the role of the framework Al atoms in controlling the dissolution mechanisms.
Marco Voltolini, Gilberto Artioli
exaly   +2 more sources

An X-ray single crystal study of alkaline cations influence on laumontite hydration ability: II. Pressure-induced hydration of Na,K-rich laumontite

Microporous and Mesoporous Materials, 2012
Yurii Seryotkin, Sergey Rashchenko
exaly   +2 more sources

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 ...
openaire   +1 more source

Laumontite in Soils of the San Gabriel Mountains, California

Soil Science Society of America Journal, 1990
Abstract Laumontite, a Ca‐rich zeolite, is widespread and locally abundant in the San Gabriel Mountains of southern California. It occurs in hydrothermally altered rocks of various origins and is inherited by the overlying soils.
Kelly Taylor, Robert C. Graham, Jarel O. Ervin   +2 more
openaire   +1 more source

Secondary Porosity in Laumontite-Bearing Sandstones

1984
Abstract Thermodynamic calculations indicate that, at diagenetic temperatures, laumontite is stable only in the presence of fluids of high pH and low . This is supported by experimental dissolution studies that suggest that laumontite is soluble in the presence of carboxylic acids.
Laura J. Crossey, B. Ronald Frost, Ronald C. Surdam   +2 more
openaire   +1 more source