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Infrared Evidence of Dioctahedral-Trioctahedral Site Occupancy in Palygorskite

Published online by Cambridge University Press:  01 January 2024

A. Chahi ,
S. Petit  and
A. Decarreau
A. Chahi
Affiliation:
Université Cadi Ayyad, Faculté des Sciences Semlalia, Boulevard Prince Moulay Abdellah, BP S.15 Marrakech, Morocco
S. Petit*
Affiliation:
Universite de Poitiers, UMR 6532 CNRS ‘HydrASA’, 40, Avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
A. Decarreau
Affiliation:
Universite de Poitiers, UMR 6532 CNRS ‘HydrASA’, 40, Avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
*
*E-mail address of corresponding author: sabine.petit@hydrasa.univ-poitiers.fr
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Abstract

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A Mg-rich palygorskite sample from phosphorite deposits of Ganntour (Morocco) with the structural formula Si8(Mg2.6Al1.19Fe0.33III□0.88)Ca0.056Na0.024K0.104O20(OH)2(OH2)4⋅4H2O, was studied by FTIR spectroscopy. In both OH-stretching and OH-bending regions, there is evidence of dioctahedral Al2□OH, AlFe□OH and trioctahedral Mg3OH features, leading to a di-trioctahedral crystallochemical model of octahedral site occupancies in ribbons of Ganntour palygorskite.

This model, established through the IR spectroscopy study of a Mg-rich palygorskite, seems to be appropriate for many other palygorskites with lower Mg content in the octahedral sheet.

Keywords

Cation DistributionFTIR SpectroscopyOctahedral OccupancyPalygorskite
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 3 , June 2002 , pp. 306 - 313
Copyright
Copyright © 2002, The Clay Minerals Society

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