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Maghemite in soils and its origin

I. Properties and observations on soil maghemites

Published online by Cambridge University Press:  09 July 2018

R. M. Taylor  and
U. Schwertmann
R. M. Taylor
Affiliation:
Institut für Bodenkunde, Technische Universität München, Freising-Weihenstephan, West Germany
U. Schwertmann
Affiliation:
Institut für Bodenkunde, Technische Universität München, Freising-Weihenstephan, West Germany
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Abstract

A magnetic iron oxide is a common constituent of ferruginous concretions in highly weathered Australian soils and is generally associated with varying proportions of hematite and occasionally with goethite. The X-ray diffraction pattern and the low Fe (11) contents (4-15% of total Fe) of this magnetic phase identify it as maghemite which was further confirmed by IR and DTA. This maghemite is only slightly soluble in dithionite but readily in 1:1 HCl or oxalic acid. From the Fe (11) contents and mineralogical associations in soil concretions, conditions for maghemite formation under near pedogenic conditions are suggested.

Type
Research Article
Information
Clay Minerals , Volume 10 , Issue 4 , December 1974 , pp. 289 - 298
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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