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The Coordination of Aluminum Ions in the Palygorskite Structure

Published online by Cambridge University Press:  28 February 2024

Necip Güven ,
Jean-Baptiste d'Espinose de la Caillerie  and
Jose J. Fripiat
Necip Güven
Affiliation:
Department of Geosciences, Texas Tech University, P.O. Box 4109, Lubbock, Texas 79409
Jean-Baptiste d'Espinose de la Caillerie
Affiliation:
Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201
Jose J. Fripiat
Affiliation:
Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201
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Abstract

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NMR spectra of PF1-1 Floridan palygorskite strongly suggest that Al3+ occurs only in octahedral coordination. X-ray microanalysis of the palygorskite fibers indicate a chemical composition defined by the atomic ratios: Mg/Si = 0.34, Al/Si = 0.27, and Fe/Si = 0.04. Considering the NMR and CEC data in this report along with the previously published results of IR and Mössbauer spectroscopic studies, the following structural formula is proposed for PF1-1 palygorskite:

$${\rm{(M{g_{2.12}}A{l_{1.68}}F{e^{3 + }}_{0.24}{\square _{0.96}})S{i_8}{O_{20}}{(OH)_2}{(O{H_2})_4}}}$$
where □ represents the vacant Ml octahedral sites in the structure, and Al3+ and Fe3+ are all exclusively assigned to the octahedral sites.

Keywords

Al-coordinationMAS-NMRPalygorskite
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 4 , August 1992 , pp. 457 - 461
Copyright
Copyright © 1992, The Clay Minerals Society

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