Octahedral Compositions of Individual Particles in Smectite-Palygorskite and Smectite-Sepiolite Assemblages
Hélène Paquet, Joëlle Duplay, Marie-Madeleine Valleron-Blanc, Georges Millot, 1985. "Octahedral Compositions of Individual Particles in Smectite-Palygorskite and Smectite-Sepiolite Assemblages", Proceedings of the International Clay Conference Denver, 1985, Leonard G. Schultz, H. van Olphen, Frederick A. Mumpton
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Chemical analyses were carried out on individual particles in <2-μm size fractions to study smectite-palygorskite and smectite-sepiolite assemblages extracted from calcareous and dolomitic continental formations in Provence, southeastern France. A plot of the octahedral composition of 145 individual particles of each clay mineral species considered on a (Al + Fe3+) vs. Mg diagram shows a great variability for smectites and fibrous clays. The octahedral composition fields of the smectites and fibrous clays partly overlap. The sepiolite field is clearly in the trioctahedral domain, whereas the paly-gorskite field is both in the dioctahedral domain as well as between the dioctahedral and trioctahedral domains of smectites. Similar to smectites, the structure of palygorskite appears to be accommodating for octahedral substitutions; however, this characteristic cannot be inferred from chemical analyses of whole <2-μm fractions, which represent the average composition of several particles.
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Proceedings of the International Clay Conference Denver, 1985
The papers included in this proceedings volume are representative of the research on clays being conducted in all parts of the world at the time of publication. Many of the subjects treated are controversial, and although some ideas expressed may not necessarily represent the views of the editors, the referees, or the publisher, they deserve to be brought to the attention of the international clay community.