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Possible confusion between so-called ferrihydrites and hisingerites

Published online by Cambridge University Press:  09 July 2018

V. C. Farmer
V. C. Farmer*
Affiliation:
The Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB9 2QJ, UK
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Abstract

The term ferrihydrite, originally defined as a poorly ordered hydrous ferric oxide exhibiting five or more distinctive X-ray diffraction maxima, has come to be extended to include species that exhibit only 4, 3 or 2 of these maxima. It is pointed out here that hisingerites may exhibit a similar 2-line diffraction pattern. The laboratory synthesis of hisingerites show that they can form under soil conditions. Acid oxalate buffer of pH 3, a reagent considered a fairly specific solvent for ferrihydrite, extracts the iron content of these synthetic hisingerites quantitatively.

Type
Research Article
Information
Clay Minerals , Volume 27 , Issue 3 , September 1992 , pp. 373 - 378
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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