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Isomorphous Substitution of Iron for Aluminium in Some Soil Kaolinites

Published online by Cambridge University Press:  01 July 2024

P. Rengasamy ,
G. S. R. Krishna Murti  and
V. A. K. Sarma
P. Rengasamy
Affiliation:
Indian Agricultural Research Institute, New Delhi 110 012, India
G. S. R. Krishna Murti
Affiliation:
Indian Agricultural Research Institute, New Delhi 110 012, India
V. A. K. Sarma
Affiliation:
Indian Agricultural Research Institute, New Delhi 110 012, India
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Abstract

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Clay (<2 μm) and fine silt (2–20 μm) fractions of twenty seven soil samples from eight tropical ferruginous profiles of the Mysore Plateau (India) were analysed for kaolinite by dehydroxylation and selective dissolution. The considerable amounts of iron extracted by the procedure and the closeness of the SiO2/R2O3 molar ratios (2·00–2·18) to the ideal value of 2·00 indicated that iron was a structural constituent of the kaolinites. The calculated unit cell cation composition of the kaolinites showed a substitution of 0·11–0·82 atoms of Fe(III) for Al in every four octahedral sites. The kaolinites in these soils appear to be products of crystallization from weathering solutions.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 3 , June 1975 , pp. 211 - 214
Copyright
Copyright © 1975, The Clay Minerals Society

Footnotes

*

Complete description of the soil profiles was reported by Rengasamy (1973).

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