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

Published online by Cambridge University Press:  28 February 2018

Teodoro Gauzzi ,
Leonardo Martins Graça ,
Leonardo Lagoeiro ,
Isolda de Castro Mendes  and
Gláucia Nascimento Queiroga
Teodoro Gauzzi*
Affiliation:
Department of Geology, Federal University of Ouro Preto, Ouro Preto, MG 35400-000, Brazil
Leonardo Martins Graça
Affiliation:
Department of Geology, Federal University of Ouro Preto, Ouro Preto, MG 35400-000, Brazil
Leonardo Lagoeiro
Affiliation:
Department of Geology, Federal University of Paraná, Curitiba, PR 81531-980, Brazil
Isolda de Castro Mendes
Affiliation:
Department of Chemistry, Federal University of Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
Gláucia Nascimento Queiroga
Affiliation:
Department of Geology, Federal University of Ouro Preto, Ouro Preto, MG 35400-000, Brazil
*
*E-mail: [email protected]
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Abstract

A 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.

Keywords

imperial topazOuro Pretotrace elementscathodoluminescence
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 4 , August 2018 , pp. 943 - 960
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Martin Lee

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