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Fe-Speciation in Kaolins: A Diffuse Reflectance Study

Published online by Cambridge University Press:  28 February 2024

Nathalie Malengreau ,
Jean-Pierre Muller  and
Georges Calas
Nathalie Malengreau*
Affiliation:
Laboratoire de Minéralogie-Cristallographie, URA CNRS 09 Universités de Paris 6 et 7, 4 Place Jussieu, 75 252 Paris Cedex 05, France
Jean-Pierre Muller
Affiliation:
Laboratoire de Minéralogie-Cristallographie, URA CNRS 09 Universités de Paris 6 et 7, 4 Place Jussieu, 75 252 Paris Cedex 05, France O.R.S.T.O.M., Département T.O.A., 213 Rue La Fayette, 75 480, Paris Cedex 10, France
Georges Calas
Affiliation:
Laboratoire de Minéralogie-Cristallographie, URA CNRS 09 Universités de Paris 6 et 7, 4 Place Jussieu, 75 252 Paris Cedex 05, France
*
*Present address: Department of Soil Science, University of California, Berkeley, CA 94720
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Abstract

Diffuse reflectance spectra of kaolins have been recorded in samples from different environments. They show the systematic presence of Fe-oxides, even in bleached kaolins, with no contribution from the Fe3+ ions substituted in kaolinite. Second derivative spectra of various Fe-phases (hematite, goethite, lepidocrocite, maghemite, akaganeite, ferrihydrite and Fe-polymer) may be differentiated by the position of a diagnostic band corresponding to the 2(6A1) → 2(4T1(4G)) transition. The systematic comparison of diffuse reflectance spectra of unbleached and bleached kaolins has demonstrated the differences between the Fe-oxides occurring as coatings and as occluded phases. The features observed in second derivative spectral curves are consistent with assignments of crystal field transitions to goethite, hematite, akaganeite, and aged hydrous ferric oxides. The optical determination of the Fe-phases associated to kaolins assists in the interpretation of the formation conditions of these minerals.

Keywords

Diffuse reflectance spectroscopyFe-speciationKaolinSecond derivative spectra
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 2 , April 1994 , pp. 137 - 147
Copyright
Copyright © 1994, Clay Minerals Society

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