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Minerals 2018, 8(7), 308; https://doi.org/10.3390/min8070308

Sharyginite, Ca3TiFe2O8, A New Mineral from the Bellerberg Volcano, Germany

1
Department of Geochemistry, Mineralogy and Petrography, Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland
2
Institute of Mineralogy and Petrography, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria
3
Institute of Geochemistry, Mineralogy and Petrology, University of Warsaw, Al. Żwirki and Wigury 93, 02-089 Warszawa, Poland
4
Dienstleistungszentrum Ländlicher Raum (DLR) Westerwald-Osteifel-Aussenstelle Mayen, Bahnhofstrasse 45, DE-56727 Mayen, Germany
5
Swiss Light Source, Paul Scherrer Institute, 5232 Villigen, Switzerland
6
Fersman Mineralogical Museum RAS, Leninskiy pr, 18/2, 115162 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 27 June 2018 / Revised: 17 July 2018 / Accepted: 17 July 2018 / Published: 21 July 2018
(This article belongs to the Special Issue New Mineral Species and Their Crystal Structures)
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Abstract

The new mineral sharyginite, Ca3TiFe2O8 (P21ma, Z = 2, a = 5.423(2) Å, b = 11.150(8) Å, c = 5.528(2) Å, V = 334.3(3) Å3), a member of the anion deficient perovskite group, was discovered in metacarbonate xenoliths in alkali basalt from the Caspar quarry, Bellerberg volcano, Eifel, Germany. In the holotype specimen, sharyginite is widespread in the contact zone of xenolith with alkali basalt. Sharyginite is associated with fluorellestadite, cuspidine, brownmillerite, rondorfite, larnite and minerals of the chlormayenite-wadalite series. The mineral usually forms flat crystals up to 100 µm in length, which are formed by pinacoids {100}, {010} and {001}. Crystals are flattened on (010). Sharyginite is dark brown, opaque with a brown streak and has a sub-metallic lustre. In reflected light, it is light grey and exhibits rare yellowish-brown internal reflections. The calculated density of sharyginite is 3.943 g·cm-3. The empirical formula calculated on the basis of 8 O apfu is Ca3.00(Fe3+1.00Ti4+0.86Mn4+0.11Zr0.01Cr3+0.01Mg0.01)Σ2(Fe3+0.76Al0.20Si0.04)Σ1.00O8. The crystal structure of sharyginite, closely related to shulamitite Ca3TiFeAlO8 structure, consists of double layers of corner-sharing (Ti, Fe3+) O6 octahedra, which are separated by single layers of (Fe3+O4) tetrahedra. We suggest that sharyginite formed after perovskite at high-temperature conditions >1000°C. View Full-Text
Keywords: sharyginite; new mineral; crystal structure; Raman spectroscopy; Bellerberg volcano; Germany sharyginite; new mineral; crystal structure; Raman spectroscopy; Bellerberg volcano; Germany
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Juroszek, R.; Krüger, H.; Galuskina, I.; Krüger, B.; Jeżak, L.; Ternes, B.; Wojdyla, J.; Krzykawski, T.; Pautov, L.; Galuskin, E. Sharyginite, Ca3TiFe2O8, A New Mineral from the Bellerberg Volcano, Germany. Minerals 2018, 8, 308.

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