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).
|Number of pages||8|
|Journal||Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics|
|Publication status||Published - 1978|