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Effect of heat treatment on tourmaline from Brazil

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Abstract

The crystal-chemical behaviour of tourmaline from Araçuaí, Minas Gerais state, Brazil, when subjected to heating in air atmosphere has been studied by several techniques, including EMPA, UV–Vis, TGA, and Mössbauer spectroscopy. The tourmaline samples are typically intermediate members of the elbaite-schorl series. The origin of colour and of its change after treatment has been discussed in terms of local disorder, presence of metal transition elements, oxidation of ferrous iron at the octahedral site, and simultaneous trap of the excess electron. These findings may be used to enhance the colour in tourmaline crystals or generate wanted colour changes.

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Acknowledgements

The authors are indebted to the Brazilian research-funding agencies Conselho Nacional de Pesquisa (CNPq), CAPES and Fundação Educativa de Ouro Preto (FEOP). Financial support for the Mössbauer study was obtained from the Fund for Scientific Research—Flanders, Belgium, grant G018503. Special acknowledgments go to Dr. A.C.S. Sabione, César Mendonça, and José Davi Cabral from Universidade Federal de Ouro Preto, Brazil. The work benefited from the reviews of Y. Fuchs and an anonymous reviewer.

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Author notes

  1. Sigrid G. Eeckhout

    Present address: European Synchrotron Radiation Facility, Grenoble, France

Authors and Affiliations

  1. Centro de Pesquisa Manuel Teixeira da Costa/IGC/UFMG, Av. Antônio Carlos, Campus Pampulha, CEP 31270-901, Belo Horizonte, Brazil

    Cristiane Castañeda

  2. Department of Subatomic and Radiation Physics, Ghent University, Ghent, Belgium

    Sigrid G. Eeckhout & Eddy De Grave

  3. Departamento de Química/ICEB/UFOP, Ouro Preto, Brazil

    Geraldo Magela da Costa

  4. Instituto de Geociências/UnB, Brasilia, Brazil

    Nilson F. Botelho

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  1. Cristiane Castañeda
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  2. Sigrid G. Eeckhout
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  3. Geraldo Magela da Costa
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  4. Nilson F. Botelho
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  5. Eddy De Grave
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Correspondence to Cristiane Castañeda.

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Castañeda, C., Eeckhout, S.G., Costa, G.M.d. et al. Effect of heat treatment on tourmaline from Brazil. Phys Chem Minerals 33, 207–216 (2006). https://doi.org/10.1007/s00269-006-0067-0

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