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On the Chemical Composition of Sepiolite and Palygorskite

Published online by Cambridge University Press:  01 January 2024

E. Garciá-Romero  and
M. Suárez
E. Garciá-Romero*
Affiliation:
Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense, Madrid, Spain
M. Suárez
Affiliation:
Departamento de Geología, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain
*
* E-mail address of corresponding author: mromero@geo.ucm.es
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Abstract

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Many studies of the chemical composition of sepiolite and palygorskite have been carried out using analytical electron microscopy (AEM). According to the literature, a compositional gap exists between sepiolites and palygorskites, but the results presented here show that they may all be intermediate compositions between two extremes. The results of >1000 AEM analyses and structural formulae have been obtained for the samples studied (22 samples of sepiolite and 21 samples of palygorskite) and indicate that no compositional gap exists between sepiolite and palygorskite. Sepiolite occupies the most magnesic and trioctahedral extreme and palygorskite the most aluminic-magnesic and dioctahedral extreme. Sepiolite and palygorskite with intermediate compositions exist between the two pure extremes: (1) sepiolite with a small proportion of octahedral substitution; (2) palygorskite with a very wide range of substitution (the pure dioctahedral extreme is unusual); and (3) intermediate forms, Al-sepiolite and Mg-palygorskite with similar or the same chemical composition. The chemical compositions of the intermediate forms can be so similar that a certain degree of polymorphism exists between Al-sepiolite and Mg-palygorskite.

Keywords

Chemical CompositionOctahedral SheetOctahedra cationsPalygorskiteSepiolite
Type
Article
Information
Clays and Clay Minerals , Volume 58 , Issue 1 , February 2010 , pp. 1 - 20
Copyright
Copyright © Clay Minerals Society 2010

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