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57Fe Mössbauer effect study of bannisterite: a modulated 2:1-type phyllosilicate

Published online by Cambridge University Press:  05 July 2018

E. A. Ferrow
E. A. Ferrow*
Affiliation:
GeoBiosphere Science Centre, Department of Geology, Lithosphere Biosphere Science, Lund University, Sölvegatan 12, S-223 62 Lund, Sweden
*
*E-mail: embaie.ferrow@geol.lu.se
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Abstract

Bannisterite is a modulated 2:1-type phyllosilicate having ten octahedral sites with hydroxyl groups in trans, cis and combined trans-cis configurations. Each octahedral site, depending on its proximity to the layer modulation, is exposed to a different degree of distortion. The electric field gradient at the Fe site and the site distortion are used to propose a model for the site assignment and oxidation mechanism in bannisterite. The results show that two models are compatible with the experimental results of fitting the spectrum of bannisterite. However, the model which allows for site distortion accounts better for the observed line overlap of the [6]Fe2+ sites. Accordingly, the octahedral sites with a greater degree of distortion are assigned to the [6]Fe2+ with lower electric quadrupole splitting, and the octahedral sites with lower site distortion are assigned to the [6]Fe2+ with higher electric quadrupole splitting. Moreover, the ease of oxidation decreases in the order trans > trans-cis > cis.

Keywords

bannisteriteMössbauerdistortionelectric field gradientsite assignment
Type
Research Article
Information
Mineralogical Magazine , Volume 70 , Issue 2 , April 2006 , pp. 187 - 199
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

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