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Minerals 2017, 7(10), 189;

Trace Element Compositions and Defect Structures of High-Purity Quartz from the Southern Ural Region, Russia

Institute of Mineralogy, TU Bergakademie Freiberg, Brennhausgasse 14, 09596 Freiberg, Germany
Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK S7N5E2, Canada
Naturhistorisk Museum, Universitet i Oslo, P.O. Box 1172, Blindern, 0318 Oslo, Norway
Natural History Museum, Cromwell Road, London SW7 5BD, UK
Mining State University St. Petersburg, 21st Line, St. Petersburg 199106, Russia
Author to whom correspondence should be addressed.
Received: 14 September 2017 / Revised: 5 October 2017 / Accepted: 5 October 2017 / Published: 11 October 2017
(This article belongs to the Special Issue Mineralogy of Quartz and Silica Minerals)
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Quartz samples of different origin from 10 localities in the Southern Ural region, Russia have been investigated to characterize their trace element compositions and defect structures. The analytical combination of cathodoluminescence (CL) microscopy and spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, and trace-element analysis by inductively coupled plasma mass spectrometry (ICP-MS) revealed that almost all investigated quartz samples showed very low concentrations of trace elements (cumulative concentrations of <50 ppm with <30 ppm Al and <10 ppm Ti) and low abundances of paramagnetic defects, defining them economically as “high-purity” quartz (HPQ) suitable for high-tech applications. EPR and CL data confirmed the low abundances of substitutional Ti and Fe, and showed Al to be the only significant trace element structurally bound in the investigated quartz samples. CL microscopy revealed a heterogeneous distribution of luminescence centres (i.e., luminescence active trace elements such as Al) as well as features of deformation and recrystallization. It is suggested that healing of defects due to deformation-related recrystallization and reorganization processes of the quartz lattice during retrograde metamorphism resulted in low concentrations of CL activator and other trace elements or vacancies, and thus are the main driving processes for the formation of HPQ deposits in the investigated area. View Full-Text
Keywords: quartz; cathodoluminescence; electron paramagnetic resonance; trace elements quartz; cathodoluminescence; electron paramagnetic resonance; trace elements

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Götze, J.; Pan, Y.; Müller, A.; Kotova, E.L.; Cerin, D. Trace Element Compositions and Defect Structures of High-Purity Quartz from the Southern Ural Region, Russia. Minerals 2017, 7, 189.

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