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Magnesio-lucchesiite from the Kowary vicinity, Karkonosze Mountains, SW Poland: the third occurrence worldwide

Published online by Cambridge University Press:  14 October 2022

Mateusz P. Sęk Open the ORCID record for Mateusz P. Sęk [Opens in a new window] ,
Adam Włodek Open the ORCID record for Adam Włodek [Opens in a new window] ,
Marcin Stachowicz Open the ORCID record for Marcin Stachowicz [Opens in a new window] ,
Krzysztof Woźniak Open the ORCID record for Krzysztof Woźniak [Opens in a new window]  and
Adam Pieczka Open the ORCID record for Adam Pieczka [Opens in a new window]
Mateusz P. Sęk*
Affiliation:
Department of Mineralogy, Petrography and Geochemistry, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
Adam Włodek
Affiliation:
Department of Mineralogy, Petrography and Geochemistry, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
Marcin Stachowicz
Affiliation:
University of Warsaw, Faculty of Geology, 02-089 Warszawa, Żwirki and Wigury 93, Poland
Krzysztof Woźniak
Affiliation:
University of Warsaw, Department of Chemistry, 02-093 Warszawa, Pasteura 1, Poland
Adam Pieczka
Affiliation:
Department of Mineralogy, Petrography and Geochemistry, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
*
*Author for correspondence: Mateusz P. Sęk, Email: msek@agh.edu.pl
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Abstract

Two tourmaline samples occurring in quartz veinlets, which cross-cut an amphibolite body at the Budniki camp near the Kowary town in the south-west part of the Karkonosze Mountains, SW Poland, were studied through microprobe and single crystal X-ray diffraction. Samples were extracted from core and rim regions of crystals with concentric zoning. Chemical and structural data revealed that the core tourmaline is characterised by a dravite–oxy-dravite composition, with the formula: X(Na0.82Ca0.07K0.01Sr0.01□0.09)Σ1Y(Mg1.73Fe2+0.81Fe3+0.41Ti0.04V0.01)Σ3Z(Al5.85Fe3+0.15)Σ6(TSi6O18)(BO3)3(OH)3W(OH0.50O0.50)Σ1 and unit cell parameters a = 15.97377(14) Å and c = 7.22644(7) Å. The rim part of the crystals has a magnesio-lucchesiite composition, described by the formula: X(Ca0.49Na0.41K0.04Sr0.02□0.04)Σ1Y(Mg1.87Fe2+0.95Ti0.15Fe3+0.02V0.02)Σ3Z(Al5.49Fe3+0.51)Σ6(BO3)3(TSi6O18)(OH)3W(O0.81F0.18OH0.01)Σ1 with unit cell parameters a = 15.9863(3) Å and c = 7.22426(15) Å. Both tourmalines show similar refined populations at the Y and Z sites: Y[(Fe2+0.810Mg0.680)Σ1.490(Al1.044Fe3+0.413V0.009)Σ1.465Ti0.045]Σ3Z(Al4.806Mg1.042Fe3+0.152)Σ6 (dravite–oxy-dravite), and Y[(Fe2+0.945Mg0.750)Σ1.695(Al0.737Fe3+0.404V0.018)Σ1.159Ti0.146]Σ3Z(Al4.749Mg1.115Fe3+0.137)Σ6 (magnesio-lucchesiite), with a comparable Mg/(Mg + Fe) ratio of ~0.54–0.56, oxidation of Fe expressed as Fe3+/Fetotal ratio ~0.36–0.41, and trace components such as Ti, Sr, V, Cr, Ni and Co. The geological history of the eastern Karkonosze region in the Kowary vicinity indicates that both tourmalines crystallised from B-bearing metamorphic fluids mobilised by Variscan prograde metamorphism from the protoliths of the Velká Upá mica schists that host the Budniki amphibolite. The fluids migrated into the tectonised amphibolite enriched in Ti, V, Cr, Ni and Co, and mineralised the fractures within it through deposition of soluble species in the form of quartz–tourmaline veinlets. Magnesio-lucchesiite crystallised in an early retrogression stage, probably from Ca- and F-bearing fluids secondary enriched in B by the dissolution of dravite–oxy-dravite. The Budniki camp is, in addition to the type and co-type magnesio-lucchesiite localities, the third documented occurrence of the species worldwide.

Keywords

magnesio-lucchesiiteoxy-dravitedravitetourmalinestructure refinement
Type
Article
Information
Mineralogical Magazine , Volume 87 , Issue 1 , February 2023 , pp. 60 - 68
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Giancarlo Della Ventura

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