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Evidence for loss of protons and octahedral iron from oxidized biotites and vermiculites

Published online by Cambridge University Press:  05 July 2018

V. C. Farmer ,
J. D. Russell ,
W. J. McHardy ,
A. C. D. Newman ,
J. L. Ahlrichs  and
J. Y. H. Rimsaite
V. C. Farmer
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, Scotland
J. D. Russell
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, Scotland
W. J. McHardy
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, Scotland
A. C. D. Newman
Affiliation:
Pedology Department, Rothamsted Experimental Station, Harpenden, Herts.
J. L. Ahlrichs
Affiliation:
Purdue University, Lafayette, Indiana, U.S.A.
J. Y. H. Rimsaite
Affiliation:
Geology Survey of Canada, Ottawa, Canada
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Summary

Infra-red examination of a weathered biotite and of biotites that have been converted to vermiculites and subsequently oxidized, indicates that oxidation of octahedral ferrous ions to ferric ions is associated with a reversible conversion of hydroxyl ions to oxide ions. Subsequently, in high-iron biotites, there is an irreversible loss of ferric ions from the octahedral layer, resulting in an increased number of dioctahedral sites. Electron microscopy and X-ray diffraction indicate that ejected ferric ions form either amorphous interlayer oxides or, when bromine is used as an oxidant, a crystalline external phase of β-FeOOH. The high refractive index of some oxidized vermiculites is shown to be due largely to submicroscopic iron oxides.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 294 , June 1971 , pp. 121 - 137
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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