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Selective dissolution and formula derivation of clay vermiculite from some Tuscan soils

Published online by Cambridge University Press:  09 July 2018

G. G. Ristori ,
S. Cecconi ,
V. Vidrich  and
G. Pacifici
G. G. Ristori
Affiliation:
Istituto di Chimica Agraria e Forestale dell'Università di Firenze, Centro di Studio per i Colloidi del Suolo del C.N.R., Piazzale delle Cascine, n° 28 50144-Firenze-Italy
S. Cecconi
Affiliation:
Istituto di Chimica Agraria e Forestale dell'Università di Firenze, Centro di Studio per i Colloidi del Suolo del C.N.R., Piazzale delle Cascine, n° 28 50144-Firenze-Italy
V. Vidrich
Affiliation:
Istituto di Chimica Agraria e Forestale dell'Università di Firenze, Centro di Studio per i Colloidi del Suolo del C.N.R., Piazzale delle Cascine, n° 28 50144-Firenze-Italy
G. Pacifici
Affiliation:
Istituto di Chimica Agraria e Forestale dell'Università di Firenze, Centro di Studio per i Colloidi del Suolo del C.N.R., Piazzale delle Cascine, n° 28 50144-Firenze-Italy
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Abstract

The chemical composition and structural characteristics of clays from samples of eight Tuscan soils were investigated. Using simple selective dissolution method (successive boiling in 1 N HCl and 0·5 N NaOH) it was possible to distinguish two types of low charge dioctahedral vermiculite; one easily HCl soluble the other practically insoluble.

Structural formulae for the soluble type were calculated from the chemical analysis of the dissolved material; for the insoluble type it was possible to calculate only an 'average' structural formula which included the micaceous material.

Since the HCl soluble vermiculites show a high content of Fe and Mg, they can be considered either as alteration products of glauconites or biotites, or as a result of a synthesis, at least in soils derived from basic rocks which do not contain mica.

The aluminous insoluble type, present also in parent material, may be the result of an incomplete 'illitization' in a marine environment.

Type
Research Article
Information
Clay Minerals , Volume 10 , Issue 4 , December 1974 , pp. 279 - 287
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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