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The nontronite-saponite series; an experimental approach

Olivier Grauby, Sabine Petit, Alain Decarreau and Alain Baronnet
The nontronite-saponite series; an experimental approach
European Journal of Mineralogy (February 1994) 6 (1): 99-112


A study was made of the octahedral Fe-Mg substitution in smectites, using clay synthesis at 200 degrees C. Mossbauer data revealed that only ferric iron occurs in synthetic smectites, indicating that this series is heterovalent. All clays synthesized were tetrahedrally charged, leading to structural formulae varying between nontronite and saponite end-members. XRD data showed that the b parameter increases continuously with Mg-content. TEM analyses of isolated clay particles show a continuous evolution between the two end-members. However, IR data provide evidence for the segregation of octahedral cations in local dioctahedral and trioctahedral arrangements. The series is thus a true continuous solid solution from nontronite to saponite, with differentated octahedral clusters.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 1
Title: The nontronite-saponite series; an experimental approach
Affiliation: Universite de Poitiers, Laboratoire de Petrologie de la Surface, Poitiers, France
Pages: 99-112
Published: 199402
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 49
Accession Number: 1994-025439
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 3 tables
Secondary Affiliation: C.N.R.S., FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199412
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