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Characterization and crystal chemistry of an Fe-rich montmorillonite from Ölberg, Germany

Published online by Cambridge University Press:  09 July 2018

S. Petit ,
J . Caillaud ,
D. Righi ,
J . Madejová ,
F. Elsass  and
H. M. Köster
S. Petit*
Affiliation:
UMR 6532 CNRS, HydrASA, Faculté des Sciences, 86022 Poitiers Cedex, France
J . Caillaud
Affiliation:
UMR 6532 CNRS, HydrASA, Faculté des Sciences, 86022 Poitiers Cedex, France
D. Righi
Affiliation:
UMR 6532 CNRS, HydrASA, Faculté des Sciences, 86022 Poitiers Cedex, France
J . Madejová
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, 842 36 Bratislava, Slovakia
F. Elsass
Affiliation:
Unité de Science du Sol, INRA, 78026 Versailles Cedex, France
H. M. Köster
Affiliation:
Lehrstuhl für Angewandte Mineralogie und Geochemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany
*
*E-mail: Sabine.Petit@hydrasa.univ-poitiers.fr
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Abstract

An Fe-rich smectite from Ölberg (Germany) was characterized using X-ray diffraction, infrared spectroscopy and analytical electron microscopy. Progressive reduction of the octahedral charge was performed through the Hofmann & Klemen effect at increasing temperatures. The sample was heterogeneous, consisting of two smectite populations. One population, which comprises a minor portion of the sample, is an ‘Fe3+-montmorillonite’ with little or no tetrahedral charge and Fe3+ as the major octahedral cation. The other population, a major constituent of the sample, contains less Mg and more Al than the first one and exhibits some tetrahedral charge. This fraction may be considered as an inter-grade between nontronite (dominant tetrahedral charge) and Fe3+-montmorillonite (dominant octahedral charge). These two populations may occur as separate particles but also as interstratified layers.

Keywords

Fe-montmorillonitecrystal chemistrycharge distributionÖlbergGermanyclay mineralXRDFTIRAEM
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 2 , June 2002 , pp. 283 - 297
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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