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Stacking Order in a 14.30-Å Mg-Vermiculite

Published online by Cambridge University Press:  02 April 2024

Cristina de la Calle ,
Hélène Suquet  and
Charles-Henri Pons
Cristina de la Calle
Affiliation:
Instituto de Ciencia de Materiales, CSIC Calle Serrano 113, 28006 Madrid, Spain
Hélène Suquet
Affiliation:
Laboratoire de Réactivité de Surface et Structure, CNRS U.A. 1106, Université P. et M. Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France
Charles-Henri Pons
Affiliation:
Laboratoire de Cristallographie, CNRS U.A. 810, Université d'Orléans, B.P. 6759, rue de Chartres, 45067 Orléans Cedex 2, France
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Abstract

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The stacking order of a 14.30-Å Mg-vermiculite from Santa-Olalla, Spain, has been determined from Weissenberg photographs. The results prove that the Mg-vermiculite structure is not a 2-layer polytype structure, but a semi-ordered one. Because the structure is semi-ordered, its resolution needed a dual approach: (1) a direct approach using an electron density projection along the y axis in conjunction with a one-dimensional electron-density projection onto the z axis; and (2) an indirect approach in which the observed intensities along the (0,k) and (1,k) reciprocal rods were compared to the calculated intensities given by model defect structures. The semi-ordered structure of the Mg-vermiculite results from ±b/3 shifts in the stacking of the silicate layers. The shifts are randomly either along +b or -b.

Keywords

Crystal structureOrderingPolytypeStackingVermiculite
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 6 , December 1988 , pp. 481 - 490
Copyright
Copyright © 1988, The Clay Minerals Society

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