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Kaolinite/Montmorillonite Resembles Beidellite

Published online by Cambridge University Press:  28 February 2024

J. Cuadros ,
A. Delgado ,
A. Cardenete ,
E. Reyes  and
J. Linares
J. Cuadros
Affiliation:
U.E.I. Fisicoquímica y Geoquimica Mineral, Estación Experimental del Zooidín (C.S.I.C.), Profesor Albareda 1, 18008 Granada, Spain
A. Delgado
Affiliation:
U.E.I. Fisicoquímica y Geoquimica Mineral, Estación Experimental del Zooidín (C.S.I.C.), Profesor Albareda 1, 18008 Granada, Spain
A. Cardenete
Affiliation:
Departamento de Química Física, Facultad de Ciencias, Universidad de Granada, Campus Universitario de Fuentenueva, 18001 Granada, Spain
E. Reyes
Affiliation:
U.E.I. Fisicoquímica y Geoquimica Mineral, Estación Experimental del Zooidín (C.S.I.C.), Profesor Albareda 1, 18008 Granada, Spain
J. Linares
Affiliation:
U.E.I. Fisicoquímica y Geoquimica Mineral, Estación Experimental del Zooidín (C.S.I.C.), Profesor Albareda 1, 18008 Granada, Spain
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Abstract

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A number of smectitic samples from Almeria (SE Spain) were studied by chemical analysis, DTA, TG, XRD (oriented aggregates with ethylene glycol treatment and Greene-Kelly test), FTIR and MAS NMR. Chemically they resembled a beidellite-montmorillonite series, displaying DTA/TG characteristics already quoted in the literature in beidellite descriptions. They did not swell after the Greene-Kelly test, as it has also been reported for some beidellites. Nevertheless XRD of the oriented, glycolated samples, FTIR, MAS NMR and revision of the chemical analysis demonstrated that they were mixed-layered kaolinite/montmorillonite. It is possible that some of the reported beidellites in the literature are kaolinite/montmorillonite. Beidellite characterization must be supported by several different techniques.

Keywords

BeidelliteGreene-Kelly testKaolinite/montmorillonite
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 5 , October 1994 , pp. 643 - 651
Copyright
Copyright © 1994, Clay Minerals Society

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