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Kozłowskiite, ideally Ca4Fe2+Sn3(Si2O7)2(Si2O6OH)2, a new kristiansenite-type mineral from Szklarska Poręba, Lower Silesia, Poland

Published online by Cambridge University Press:  23 May 2022

Adam Pieczka Open the ORCID record for Adam Pieczka [Opens in a new window] ,
Sylwia Zelek-Pogudz Open the ORCID record for Sylwia Zelek-Pogudz [Opens in a new window] ,
Bożena Gołębiowska ,
Katarzyna M. Stadnicka Open the ORCID record for Katarzyna M. Stadnicka [Opens in a new window]  and
R. James Evans
Adam Pieczka*
Affiliation:
Department of Mineralogy, Petrography and Geochemistry, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
Sylwia Zelek-Pogudz
Affiliation:
Department of Mineralogy, Petrography and Geochemistry, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
Bożena Gołębiowska
Affiliation:
Department of Mineralogy, Petrography and Geochemistry, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
Katarzyna M. Stadnicka
Affiliation:
Faculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Kraków, Poland
R. James Evans
Affiliation:
Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
*
*Author for correspondence: Adam Pieczka, Email: pieczka@agh.edu.pl
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Abstract

Kozłowskiite, ideally Ca4(Fe2+Sn3)(Si2O7)2(Si2O6OH)2, is a new mineral isostructural with kristiansenite and silesiaite, found as a band in the core of a zoned silesiaite–kristiansenite crystal from the granitic pegmatite at Szklarska Poręba, Lower Silesia, Poland. In tiny pieces kozłowskiite is pale brownish, with a calculated density of 3.775 g⋅cm–3 and a mean refractive index ~1.727. The triclinic crystal structure was determined with space-group symmetry C1: a = 10.0183(2), b = 8.3861(1), c = 13.3395(2) Å, α = 89.956(1), β = 109.039(2), γ = 89.979(1)° and V = 1059.40(3) Å3, although, similarly to kristiansenite, it is metrically monoclinic (Laue group 2/m) with α and γ angles equal to 90° and a = 10.0170(3), b = 8.3860(2), c = 13.3421(4) Å, β = 109.050(3)° and V = 1059.40(5) Å3. The seven strongest reflections in the calculated powder X-ray diffraction pattern are [d in Å (I) hkl]: 5.190 (73.2) 111, 1$\bar{1}$1; 4.569 (30.0) $\bar{2}$02; 3.153 (64.7) 004; 3.094 (28.1) $\bar{3}$11, $\bar{3}\bar{1}$1; 3.089 (100) $\bar{2}\bar{2}$2, $\bar{2}$22; 2.595 (27.2) 2$\bar{2}$2, 222; and 2.141 (30.6) $\bar{3}$31, $\bar{3}\bar{3}$1. Electron microprobe analysis gave (in wt.%) SiO2 39.46, ZrO2 0.35, SnO2 31.13, Al2O3 0.35, Sc2O3 2.65, total Fe as Fe2O3 5.06 (= Fe2O3calc. 2.26; FeOcalc. 2.52), MnO 0.71, CaO 18.42 and H2Ocalc. 1.48, sum 99.33. The empirical formula on the basis of 26O + 2(OH) and 16 cations (Z = 2) is Ca4.00(Sn2.52Sc0.47Fe2+0.43Fe3+0.34Mn2+0.12Al0.08Zr0.03)Σ4.00(Si2.00O7)2(Si2.00O6OH)2. The crystal structure of kozłowskiite was refined to an R1 = 2.12% for 4887 reflections with Io>2σI. The Ca and Si sites are occupied solely by Ca and Si, respectively, and three of four M sites: M2, M3 and M4, are dominated by Sn. Four hydrogen atoms present in the kozłowskiite unit cell are shared among the O17–O27 and O47–O37 oxygen atoms where O17 and O47 are OH groups forming relatively strong hydrogen bonds.

Keywords

kozłowskiitecrystal chemistrycrystal structureRaman spectrum
Type
Article
Information
Mineralogical Magazine , Volume 86 , Issue 3 , June 2022 , pp. 507 - 517
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: Ferdinando Bosi

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