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Evidence of structural Fe(II) ions in Font-Bouillant kaolinites: a Mössbauer study

Published online by Cambridge University Press:  09 July 2018

C. Ruby ,
Ph. Refait ,
J.-M. R. Génin ,
T. Delineau  and
J. Yvon
C. Ruby
Affiliation:
Laboratoire de Chimie Physique pour l'Environnement UMR 7564 CNRS-Université Henri Poincaré Equipe sur la Réactivité des Espèces du Fer and Département Matériaux et Structures, ESSTIN, Université Henri Poincaré 405, rue de Vandoeuvre, F-54600 Villers-les-Nancy, France
Ph. Refait
Affiliation:
Laboratoire de Chimie Physique pour l'Environnement UMR 7564 CNRS-Université Henri Poincaré Equipe sur la Réactivité des Espèces du Fer and Département Matériaux et Structures, ESSTIN, Université Henri Poincaré 405, rue de Vandoeuvre, F-54600 Villers-les-Nancy, France
J.-M. R. Génin
Affiliation:
Laboratoire de Chimie Physique pour l'Environnement UMR 7564 CNRS-Université Henri Poincaré Equipe sur la Réactivité des Espèces du Fer and Département Matériaux et Structures, ESSTIN, Université Henri Poincaré 405, rue de Vandoeuvre, F-54600 Villers-les-Nancy, France
T. Delineau
Affiliation:
Laboratoire Environnement et Minéralurgie, ENSG Nancy, BP40, F-54501 Vandoeuvre Cédex, France
J. Yvon
Affiliation:
Laboratoire Environnement et Minéralurgie, ENSG Nancy, BP40, F-54501 Vandoeuvre Cédex, France
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Extract

Ferric oxides or hydroxides are common minor components of kaolinites. If free, these minerals can be removed by Fe reduction and leaching (Mehra & Jackson, 1960), but Fe3+ ions can substitute for Al3+ ions in the octahedral sites of kaolinite (Weaver et al., 1967; Malden & Meads, 1967). Moreover, Fe2+ ions can also substitute trioctahedrally in place of dioctahedral Al, leading to a local composition of Fe-antigorite (Cuttler, 1980).

The Font-Bouillant quarry (Charentes, France) is the source of disordered kaolinite known as ‘FU7, U-7-10 or FBT’ (Cases et al., 1982, 1986). The samples used in this study were considered in an earlier genetic analysis of the deposit (Delineau, 1994; Delineau et al., 1994) and were analysed previously by X-ray diffraction (XRD), infrared (IR) spectroscopy, electron paramagnetic resonance (EPR) and UV-visible spectroscopy by Delineau et al. (1994) (Table 1).

Type
Notes
Information
Clay Minerals , Volume 34 , Issue 3 , September 1999 , pp. 515 - 518
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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