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Thermally induced cation redistribution in fluor-elbaite and Fe-bearing tourmalines

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Abstract

An Fe-rich fluor-elbaite was thermally treated in air and hydrogen atmosphere up to 800 °C to study potential changes in Fe- and Al-ordering over the octahedrally coordinated Y and Z sites. Overall, the experimental data (structural refinement, electron and ion microprobe, Mössbauer, infrared and optical absorption spectroscopy) show that thermal treatment of fluor-elbaite results in an increase of Fe contents at the Z site balanced by an increase of Al at the Y site. On the basis of this and previous experimental studies on Fe–Mg–Al-bearing tourmalines, it can be stated that the intersite Fe–Mg–Al exchange rates are significant at temperatures around 700–800 °C. Thermal treatment results in an increase of ca. 0.30 Fe atoms per formula unit at the Z site compensated by a similar increase of (Mg + Al) at the Y site, following the exchange reaction YFe + Z(Mg + Al) → ZFe + Y(Mg + Al). Since the tourmaline nomenclature is based on the occupancy of ions at each structural site, the intersite Fe–Mg–Al ordering may determine the tourmaline species. This means that effectively the name associated with a given composition may be a function of the sample thermal history.

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Acknowledgements

Funding by Sapienza University of Rome (Prog. Università 2017 to F.B.) and the Swedish Research Council (H.S.) is gratefully acknowledged. E. Tillmanns and D.J. Henry are thanked for their constructive comments.

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Authors and Affiliations

  1. Department of Earth Sciences, Sapienza University of Rome, P. Aldo Moro, 5, 00185, Rome, Italy

    Ferdinando Bosi

  2. Department of Geosciences, Swedish Museum of Natural History, Box 50007, 10405, Stockholm, Sweden

    Henrik Skogby & Ulf Hålenius

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  1. Ferdinando Bosi
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  2. Henrik Skogby
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Correspondence to Ferdinando Bosi.

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Bosi, F., Skogby, H. & Hålenius, U. Thermally induced cation redistribution in fluor-elbaite and Fe-bearing tourmalines. Phys Chem Minerals 46, 371–383 (2019). https://doi.org/10.1007/s00269-018-1009-3

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