The fingerprint of imperial topaz from Ouro Preto region (Minas Gerais state, Brazil) based on cathodoluminescence properties and composition

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorAraújo, Teodoro Gauzzi Rodrigues de-
Autor(es): dc.creatorGraça, Leonardo Martins-
Autor(es): dc.creatorLagoeiro, Leonardo Evangelista-
Autor(es): dc.creatorMendes, Isolda Maria de Castro-
Autor(es): dc.creatorQueiroga, Gláucia Nascimento-
Data de aceite: dc.date.accessioned2025-08-21T15:29:10Z-
Data de disponibilização: dc.date.available2025-08-21T15:29:10Z-
Data de envio: dc.date.issued2019-05-09-
Data de envio: dc.date.issued2019-05-09-
Data de envio: dc.date.issued2017-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/11239-
Fonte completa do material: dc.identifierhttps://www.cambridge.org/core/journals/mineralogical-magazine/article/fingerprint-of-imperial-topaz-from-ouro-preto-region-minas-gerais-state-brazil-based-on-cathodoluminescence-properties-and-composition/18A550A73C41BB7E157AB419C7F5B732-
Fonte completa do material: dc.identifierhttps://doi.org/10.1180/minmag.2017.081.078-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1016397-
Descrição: dc.descriptionA study of the cathodoluminescence (CL) properties of imperial topaz from Ouro Preto region (Minas Gerais state, Brazil) and its relation with trace-element composition was conducted, using scanning electron microscope cathodoluminescence (SEM-CL), optical microscope cathodoluminescence (OM-CL), cathodoluminescence-spectrometry (CL-spectrometry), electron microprobe analysis (EMPA), laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) and Raman spectrometry. Each analytical technique allowed characterization of the imperial topaz fingerprint. SEM-CL panchromatic images show different crystal growth and resorption events in imperial topaz crystals. Colour CL images indicate only blue to violet emissions. The CL-spectra indicate a broad emission band with low intensity peak at ∼417 nm and a broad emission band with high intensity and major peaks at 685, 698, 711 and 733 nm. The EMPA indicates high OH content, in which the OH/(OH + F) ratio ranges between 0.35–0.43 (0.72 ≤ OH ≤ 0.86 apfu). High Cu and Zn concentrations (LA-ICP-MS) were measured in the high luminescence areas of SEM-CL images, suggesting both elements as CL-activators in imperial topaz. Raman and CL-spectra indicate high Cr concentrations, corroborated by EMPA and LA-ICP-MS results. The high Cr caused strong luminescence intensities that enabled their superimposition over the OH stretching mode (∼3650 cm–1) of topaz in all Raman spectra. Among trace elements, the concentrations of Ti, V, Cr, Mn, Fe, Cu, Zn, Ga and Ge provide the fingerprint of imperial topaz.-
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Direitos: dc.rightsaberto-
Palavras-chave: dc.subjectTrace elements-
Título: dc.titleThe fingerprint of imperial topaz from Ouro Preto region (Minas Gerais state, Brazil) based on cathodoluminescence properties and composition-
Tipo de arquivo: dc.typelivro digital-
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