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Crystal Chemical Differences in Al-Rich Smectites as Shown by Multivariate Analysis of Variance and Discriminant Analysis

Published online by Cambridge University Press:  02 April 2024

Alberto Alberti  and
Maria Franca Brigatti
Alberto Alberti
Affiliation:
Istituto di Mineralogia e Petrologia dell'Università, Via S. Eufemia 19, 41100 Modena, Italy
Maria Franca Brigatti
Affiliation:
Istituto di Mineralogia e Petrologia dell'Università, Via S. Eufemia 19, 41100 Modena, Italy
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Abstract

Multivariate analysis of variance and discriminant analysis were used to establish the crystal chemistry of several Al-rich smectites. The statistical analyses were carded out on 78 samples taken from the literature which were classified on the basis of their physicochemical properties. A strong discrimination exists between beidellites and montmorillonites, ‘non-ideal’ montmorillonites and ‘ideal’ montmorillonites, and Wyoming-type and Cheto-type montmorillonites. Of the Cheto-type montmorillonites, the Tatatilla-type samples are strongly discriminated, whereas the distinction between Chambers- and Otay-types is not strong. AlIV, AlVI, Fe, Mg, and Ca are generally important discriminating variables, whereas the tetrahedral portion of the layer charge, commonly used as a discriminating factor among these minerals, is only moderately significant.

Keywords

Aluminum smectiteBeidelliteChemical compositionClassificationCrystal chemistryDiscriminant analysisMultivariate analysis
Type
Research Article
Information
Clays and Clay Minerals , Volume 33 , Issue 6 , December 1985 , pp. 546 - 558
Copyright
Copyright © 1985, The Clay Minerals Society

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