Effect of heat treatment on tourmaline from Brazil |
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| Authors: | Cristiane Castañeda Sigrid G Eeckhout Geraldo Magela da Costa Nilson F Botelho Eddy De Grave |
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| Institution: | (1) Centro de Pesquisa Manuel Teixeira da Costa/IGC/UFMG, Av. Antônio Carlos, Campus Pampulha, CEP 31270-901 Belo Horizonte, Brazil;(2) Department of Subatomic and Radiation Physics, Ghent University, Ghent, Belgium;(3) Departamento de Química/ICEB/UFOP, Ouro Preto, Brazil;(4) Instituto de Geociências/UnB, Brasilia, Brazil;(5) Present address: European Synchrotron Radiation Facility, Grenoble, France |
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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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| Keywords: | Tourmaline Crystal chemistry Colour Heat treatment |
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