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Dehydroxylation of Fe3+ , Mg-rich dioctahedral micas: (I) structural transformation

Published online by Cambridge University Press:  09 July 2018

F. Muller ,
V. A. Drits ,
A. Plançon  and
G. Besson
F. Muller*
Affiliation:
ISTO, University of Orléans, CNRS, 1A, rue de la Férollerie, 45071 Orléans, Cedex 2, France
V. A. Drits
Affiliation:
Geological Institute of the Russian Academy of Sciences, Pyzhevsky per.7, MoscowRussia
A. Plançon
Affiliation:
ISTO, University of Orléans, CNRS, 1A, rue de la Férollerie, 45071 Orléans, Cedex 2, France
G. Besson
Affiliation:
ISTO, University of Orléans, CNRS, 1A, rue de la Férollerie, 45071 Orléans, Cedex 2, France
*
*E-mail: fabrice.muller@univ-orleans.fr
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Abstract

Celadonite and glauconite samples heated at different temperatures were studied by X-ray and electron diffraction. For dioctahedral micas the in-plane component of the translation between layers (ccosβ/a), which is strongly dependent on the position of the vacant octahedral site, significantly decreases at temperatures greater than the temperature of maximum dehydroxylation. The simulation of XRD patterns from different structural models reveals the actual crystal structure of dehydroxylated samples as well as the dynamics of the structural transformations. In the nonheated state the samples consist of tv (trans-vacant) 2:1 layers. During dehydroxylation, cations migrate from cis- into trans-octahedra and have 5-fold coordination. In the averaged unit-cell the ‘residual’ anions formed after the dehydroxylation reaction occupy the former OH sites with probability equal to 0.5. The migration of octahedral cations is accompanied by the transformation of the C-centred layer unit-cells into primitive ones. In contrast to Fe, Al and Mg cations have a greater ability to migrate.

Keywords

celadoniteglauconitedehydroxylationdioctahedral mica
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 3 , June 2000 , pp. 491 - 504
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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