Abstract
Abstract Annealing at 400⩽ T ⩽600 °C (40⩽ P ⩽60 MPa and HM buffer-controlled f (O 2 )) of tourmalines synthesised at the same T and P with NNO buffer induces an oxidation of Fe 2+ into Fe 3+ in some Y sites only (Mossbauer Spectroscopy data). Annealing in the same conditions of natural tourmalines is consistent with these results. FTIR spectroscopy shows that oxidation of Fe 2+ into Fe 3+ is charge-balanced by deprotonation of the external OH (3) groups. To cite this article: Y. Fuchs et al., C. R. Geoscience 334 (2002) 245–249.
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