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A Crystal-Chemical Study of Natural and Synthetic Anionic Clays

Published online by Cambridge University Press:  01 January 2024

Cristina de la Calle ,
Charles-Henri Pons ,
Jacques Roux  and
Vicente Rives
Cristina de la Calle
Affiliation:
ISTO, UMR 6113, CNRS-Université d'Orléans, 1A Rue de la Ferollerie, 45071 Orleans Cedex 2, France
Charles-Henri Pons*
Affiliation:
ISTO, UMR 6113, CNRS-Université d'Orléans, 1A Rue de la Ferollerie, 45071 Orleans Cedex 2, France
Jacques Roux
Affiliation:
ISTO, UMR 6113, CNRS-Université d'Orléans, 1A Rue de la Ferollerie, 45071 Orleans Cedex 2, France
Vicente Rives
Affiliation:
Departamento de Química Inorgánica, Universidad de Salamanca, 37008 Salamanca, Spain
*
*E-mail address of corresponding author: [email protected]
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Abstract

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A comparative crystallochemical study was performed on natural and synthetic hydrotalcite-like compounds with similar compositions. The nature of the brucite-like sheet stacking was addressed by means of powder X-ray diffraction. From the resulting electron diffraction patterns it was possible to establish the order-disorder of the cations in the brucite-like sheet. The results show that a natural sample from Snarum is an intergrowth of hydrotalcite (3R1 polytype) and manasseite (2H1 polytype) at a ratio of 77:23 (wt.%). An aluminian serpentine is associated with the hydrotalcite and manasseite minerals. The structure of a synthetic sample, Mg:Al = 2:1, was determined as space group R3¯m. For a few crystals in this sample, the octahedral cation distribution is compatible with the observed supercell (a = a′ √3). A second synthetic sample showed the presence of stacking faults and was described as a random layer sequence of two polytypes (3R and 2H).

Keywords

Anionic ClaysCrystal StructureHydrotalcite-like GroupPolytypeSnarumStacking FaultsSynthetic Double HydroxidesX-ray Diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 2 , April 2003 , pp. 121 - 132
Copyright
Copyright © 2003, The Clay Minerals Society

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