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Infrared Evidence of Dioctahedral-Trioctahedral Site Occupancy in Palygorskite
Clays and Clay Minerals, 2002AbstractA Mg-rich palygorskite sample from phosphorite deposits of Ganntour (Morocco) with the structural formula Si8(Mg2.6Al1.19Fe0.33III□0.88)Ca0.056Na0.024K0.104O20(OH)2(OH2)4⋅4H2O, was studied by FTIR spectroscopy. In both OH-stretching and OH-bending regions, there is evidence of dioctahedral Al2□OH, AlFe□OH and trioctahedral Mg3OH features ...
A. Chahi, S. Petit, A. Decarreau
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Topotactic route to synthesis of novel hydroxylated phases: I. Trioctahedral Micas
Clay Minerals, 1986AbstractK-depleted phlogopite mica was used as a topotactic precursor and treated with alkali (Li+, K+, , Rb+, Cs+), alkaline-earth (Mg2+, Ca2+, Sr2+, Ba2+) and trivalent (Al3+) cations under hydrothermal conditions of 200°C and 30 MPa pressure. K-, NH4-, Rb- and Cs-aluminosilicate micas were synthesised at 200°C in one day.
S. Komarneni, R. Roy
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Salt Displacement and Titration of AlCl3‐Treated Trioctahedral Vermiculites
Soil Science Society of America Journal, 1967Abstract Freshly prepared and 45‐day‐aged Al‐saturated trioctahedral vermiculites from Libby, Montana, and northeastern Transvaal, South Africa, were: (i) leached with 1 N and 0.05 N solutions of NaCl, KCl, and CaCl
Malek T. Kaddah, N. T. Coleman
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Hydrothermal synthesis of a Cs ferruginous trioctahedral mica
1998Hydrothermal experiments aimed at the synthesis of trioctahedral ferruginous Cs micas were carried out at 100 MPa and a constant temperature in the range 500-710 degrees C or in a temperature gradient. Starting mixes consisted of SiO(2), Fe(2)O(3), Al(2)O(3), Cs(2)CO(3); there was excess water in all runs, and in some runs also an excess of CsOH or Cs ...
DRABEK, M. +4 more
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Crystal Chemical Models on Trioctahedral and Dioctahedral Micas
2005nd
BRIGATTI, Maria Franca +5 more
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Crystal chemistry of Ba-rich trioctahedral micas-1M.
1993Ten single-crystal X-ray structure refinements of igneous and metamorphic Ba-bearing micas were determined to define the exchange vectors required to compensate for the excess in positive layer charge caused by [XII]Ba2+ for [XII]K+ substitution. The determined exchange vector is BaAlK−1Si−1.
BRIGATTI, Maria Franca, POPPI, Luciano
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