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Oxy-dravite from Wołowa Góra Mountain, Karkonosze massif, SW Poland: Crystallochemical and structural studies

Published online by Cambridge University Press:  28 February 2018

Adam Pieczka ,
Andreas Ertl ,
Mateusz P. Sęk ,
Diana Twardak ,
Sylwia Zelek ,
Eligiusz Szełęg  and
Gerald Giester
Adam Pieczka*
Affiliation:
AGH University of Science and Technology, Department of Mineralogy, Petrography and Geochemistry, al. Mickiewicza 30, 30-059 Kraków, Poland
Andreas Ertl
Affiliation:
Mineralogisch-Petrographische Abt., Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria Institut für Mineralogie und Kristallographie, Geozentrum, Universität Wien, Althanstrasse 14, A-1090 Wien, Austria
Mateusz P. Sęk
Affiliation:
AGH University of Science and Technology, Department of Mineralogy, Petrography and Geochemistry, al. Mickiewicza 30, 30-059 Kraków, Poland
Diana Twardak
Affiliation:
AGH University of Science and Technology, Department of Mineralogy, Petrography and Geochemistry, al. Mickiewicza 30, 30-059 Kraków, Poland
Sylwia Zelek
Affiliation:
AGH University of Science and Technology, Department of Mineralogy, Petrography and Geochemistry, al. Mickiewicza 30, 30-059 Kraków, Poland
Eligiusz Szełęg
Affiliation:
University of Silesia, Faculty of Earth Sciences, Department of Geochemistry, Mineralogy and Petrography, 41-200 Sosnowiec, Będzińska 60, Poland
Gerald Giester
Affiliation:
Institut für Mineralogie und Kristallographie, Geozentrum, Universität Wien, Althanstrasse 14, A-1090 Wien, Austria
*
*E-mail: [email protected]
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Abstract

Yellowish dravitic tourmaline (dominated by the oxy-dravite component) associated with secondary fluor-dravite/fluor-schorl and dravite/schorl tourmalines was found in a quartz vein cropping out in the eastern part of the Karkonosze Mountains range, SW Poland. The crystal structure of this tourmaline was refined to an R1 value of 1.85% based on single-crystal data, and the chemical composition was determined by electron-microprobe analysis. The tourmaline, a representative of the alkali-tourmaline group, has the structural formula: (Na0.75Ca0.12□0.13)Σ1(Mg1.93Al0.95Ti0.06${\rm Fe}_{{\rm 0}{\rm. 04}}^{{\rm 2 +}} $ V0.01)Σ3(Al5.38Mg0.62)Σ6B3Si6O27(OH)3(O0.46OH0.33F0.21)Σ1, and is characterized by an extremely high Mg/(Mg + Fe) ratio of 0.97–0.99, the WO2– content that reaches 0.59 apfu resulting in a local predominance of the oxy-dravitic component and Mg–Al disorder on the octahedral Y and Z sites of the order of 0.64 apfu. This disordering results in an increasing <Z–O> distance with ~1.925 Å, and unit-cell parameters a = 15.916(1) Å and c = 7.180(1) Å. The tourmaline formed during Variscan prograde metamorphism under the influence of a released (H2O,B,F)-bearing fluid. The fluid mobilized the most soluble components of partly altered silicic volcaniclastic material of the Late Cambrian to Early Ordovician bimodal volcanism to become the protolith for adjacent quartzo-feldspathic schists and amphibolites, and propagated them into the surrounding granitic gneisses of the Kowary unit in the eastern metamorphic cover of the Karkonosze granite.

Keywords

dravitic tourmalineoxy-dravitefluor-dravitedravitechemical compositioncrystal structureorder-disorder
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 4 , August 2018 , pp. 913 - 928
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Mark Welch

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