Mössbauer and analytical electron microscopic studies of an unusual orthosilicate: Chloritoid

M J Tricker, David A. Jefferson, John M. Thomas, Philip G. Manning, Christopher J. Elliott

Research output: Contribution to journalArticle

Abstract

Samples of chloritoid (a "layered" orthosilicate) from three distinct geological sources have been examined, both in the naturally occuring and heat-treated forms, by Mössbauer spectroscopy. This technique is shown to elucidate the environment of the iron present constitutionally: there is, for example, only one type of site (with octahedral symmetry in the so-called L1 layer) occupied by Fe2+. The Fe3+ ions are present to such a small extent that it did not prove feasible to evaluate their preferred siting. One of the samples (that coming from Rhode Island) displayed an anomalous Fe2+ doublet which, by a combination of energy dispersive analysis and electron diffraction (i.e., analytical electron microscopy) and spectrochemical analysis, was shown to arise from minute intergrowths of ilmenite (FeTiO3).

Original languageEnglish
Pages (from-to)174-181
Number of pages8
JournalJournal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
Volume74
DOIs
Publication statusPublished - 1978

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