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Open AccessArticle

Crystal Structure of Kristiansenite from Szklarska Poręba, Southwestern Poland

1
Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T IZ4, Canada
2
Department of Mineralogy, Petrography and Geochemistry, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
*
Author to whom correspondence should be addressed.
Minerals 2018, 8(12), 584; https://doi.org/10.3390/min8120584
Received: 28 October 2018 / Revised: 4 December 2018 / Accepted: 7 December 2018 / Published: 11 December 2018
(This article belongs to the Section Crystallography and Physical Chemistry of Minerals)
Kristiansenite, ideally Ca2ScSn(Si2O7)(Si2O6OH), a rare late-stage hydrothermal Sc-bearing sorosilicate mineral, was found in a gadolinite-fergusonite-type pegmatite of the MI-REE subclass related to the Karkonosze granite, exposed in a quarry at Szklarska Poręba, Lower Silesia, Poland. Kristiansenite occurs in an association with andradite, epidote, allanite-(Ce), titanite, fersmite, scheelite, Sc-bearing columbite-(Fe), a YNbO4 mineral as fergusonite-(Y) or fergusonite-(Y)-beta, silesiaite and wolframite. Single-crystal study of the mineral (R1 of 4.96%), with composition Ca2.00(Sn0.97Sc0.69Fe3+0.17Mn0.05Ti0.04Zr0.03Nb0.02Al0.02Ta0.01)Σ2(Si2O7)[(Si1.98Al0.02)Σ2O6.03(OH)0.97], corroborates its triclinic structure with space group-symmetry C1, Z = 2, and unit-cell parameters a = 10.0304(5), b = 8.4056(4), c = 13.3228(6) Å, α = 90.001(3), β = 109.105(3), γ = 89.997(3)° and V = 1061.40(9) Å3. In the structure of the mineral, the Ca and Si sites are dominantly occupied with Ca and Si, whereas the M1–M4 sites are disordered. The M3 and M4 sites are occupied dominantly by Sn and subordinately Sc, whereas the M1 and M2 sites are occupied dominantly by Sc and subordinately by remaining occupants, including Sn. View Full-Text
Keywords: kristiansenite; chemical composition; structure refinement; pegmatite; Szklarska Poręba; Poland kristiansenite; chemical composition; structure refinement; pegmatite; Szklarska Poręba; Poland
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MDPI and ACS Style

Evans, R.J.; Gołębiowska, B.; Groat, L.A.; Pieczka, A. Crystal Structure of Kristiansenite from Szklarska Poręba, Southwestern Poland. Minerals 2018, 8, 584.

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