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Science 28 April 1967:
Vol. 156. no. 3774, pp. 504 - 508
DOI: 10.1126/science.156.3774.504
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Articles

Mössbauer Analysis of Iron in Clay Minerals

Charles E. Weaver 1, J. M. Wampler 1, and T. E. Pecuil 1

1 Department of Earth Sciences, Georgia Institute of Technology, Atlanta 30332

Mössbauer absorption spectrography can be used to establish the presence of Fe2+ and Fe3+ in clay minerals. In the sheet structure silicates, octahedrally coordinated iron can be distinguished from tetrahedrally coordinated iron. Siderite and goethite, common contaminants of the clay minerals, can usually be detected. Goethite has a well-organized structure, though, owing to its fine grain size, it may appear to be amorphous to x-rays. The various families of clay minerals show minor differences in isomer shift and quadrupole splitting values, caused by variations in the character of the octahedral layer.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Fe-rich smectites from Gafsa (Tunisia): characterization and pillaring behaviour.
S. LETAIEF, B. CASAL, N. KBIR-ARIGUIB, M. TRABELSI-AYADI, and E. RUIZ-HITZKY (2002)
Clay Minerals 37, 517-529
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Science. ISSN 0036-8075 (print), 1095-9203 (online)