Abstract
Infrared and electron microprobe analysis of natural tourmalines from the dravite-schorl and elbaite-schorl series were carried out. The infrared study differentiates between OH groups located at the centre of hexagonal rings and those which are placed between hexagonal pillars and are coordinated to two Al ions. The correlation of infrared spectra with chemical composition of tourmalines made possible the assignment of different OH stretching bands to the more frequent octahedral cation associations. The study of the thermal dehydroxylation of tourmalines in air indentified the IR bands corresponding to OH bonded to Fe+2 ions in AlAlFe, AlFeLi or FeFeFe environments. The change in intensity of the OH absorption lines with the sample orientation has permitted the identification of several orientations of the OH bond axes. Electron microprobe analysis of zoned coloured samples has shown that the Fe, Mn distribution is partially ordered in some samples of the elbaite-schorl series.
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Paper from the NATO Advanced Study Institute on Physical Properties and Thermodynamic Behaviour of Minerals, Cambridge 1987
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Gonzalez-Carreño, T., Fernández, M. & Sanz, J. Infrared and electron microprobe analysis of tourmalines. Phys Chem Minerals 15, 452–460 (1988). https://doi.org/10.1007/BF00311124
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DOI: https://doi.org/10.1007/BF00311124