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The Mössbauer spectrum of a ferrian muscovite and its implications in the assignment of sites in dioctahedral micas

Published online by Cambridge University Press:  05 July 2018

B. A. Goodman
B. A. Goodman*
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, AB9 2QJ
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Summary

A muscovite that contains iron almost entirely in the ferric form has been studied by M6ssbauer spectroscopy. It is established that Fe3+ ions in the sites with cis hydroxyl groups have similar parameters in both muscovite and biotite. By assuming that Fe2+ ions will also have similar parameters for these sites in both minerals the M6ssbauer results of other workers have been reinterpreted. This new interpretation, which is in complete agreement with the X-ray structural analysis of Radoslovich (1960), indicates that in muscovite the sites with cis hydroxyl groups are filled in preference to those with trans hydroxyls. These sites are occupied primarily by trivalent ions. There is possibly a preference for divalent ions by the unique sites with trans hydroxyl groups, but occupation of these sites appears to occur only when the other sites have been filled.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 313 , March 1976 , pp. 513 - 517
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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