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1 Université de Poitiers, CNRS UMR 6532 HydrASA, 40, avenue du Recteur Pineau, 86022 Poitiers Cedex, France
2 Université de Limoges, CNRS UMR 6532 HydrASA, 123 avenue Albert Thomas, 87000 Limoges, France
3 Institute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, 00-818 Warszawa, Poland
4 Equipe Géomarg, UMR 5563 du CNRS, LMTG, 39, allées Jules Guesde, Université Paul Sabatier, 31000 Toulouse, France
Correspondence: * E-mail: sabine.petit{at}hydrasa.univ-poitiers.fr
The crystal-chemistry of fifteen samples of talc from various localities and origins having a relatively wide range of Fe, Al, and F contents, have been studied mainly by Fourier-transform infrared (FTIR) spectroscopy, in both the near infrared (NIR) and middle infrared (MIR) regions, and by Mössbauer spectroscopy. For the first time, assignments have been made for the 2
OH bands in talc, and Mg/Al substitutions were revealed using NIR. Less than 0.01 atom of Fe2+ or Al per half unit cell can be detected from the 2OH region, whereas the sensitivity is about half in the OH region. The amounts of F also can be quantified by NIR measurement, using the F inductive effect on the width of the 2 Mg3OH band. The NIR data show that Fe2+ and Mg are distributed randomly in their octahedral sheet. Actual structural formulae of natural talcs can be obtained from NIR and Mössbauer spectroscopies only, even for impure talc samples. NIR spectroscopy is simple to use and is a very powerful tool to study the crystal chemistry of talc.
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