A Study of the Weathering of a Biotite Using the Mössbauer Effect

B. A. Goodman and M. J. Wilson
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, AB9 2QJ

Summary: The behaviour of iron in the weathering of biotite in a sedentary soil profile developed on appinite has been investigated using the Msbauer effect. Both Fe2+ and Fe3+ in sites with cis and trans hydroxyl groups were observed at various stages in the weathering sequence. The results indicate that there is little or no ordering of the octahedral cations in the fresh biotite and hydrobiotite, but in the more weathered interstratified vermiculite-chlorite samples Fe3+ concentrates in the more distorted sites. No evidence was obtained for the presence of an anisotropic recoil-free fraction.

Mineralogical Magazine; December 1973 v. 39; no. 304; p. 448-454; DOI: 10.1180/minmag.1973.039.304.07
© 1973, The Mineralogical Society
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