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Irinarassite Ca3Sn2SiAl2O12 – new garnet from the Upper Chegem Caldera, Northern Caucasus, Kabardino-Balkaria, Russia

Published online by Cambridge University Press:  05 July 2018

I. O. Galuskina ,
E. V. Galuskin ,
K. Prusik ,
V. M. Gazeev ,
N. N. Pertsev  and
P. Dzierżanowski
I. O. Galuskina*
Affiliation:
Faculty of Earth Sciences, Department of Geochemistry, Mineralogy and Petrography, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland
E. V. Galuskin
Affiliation:
Faculty of Earth Sciences, Department of Geochemistry, Mineralogy and Petrography, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland
K. Prusik
Affiliation:
Institute of Materials Science, University of Silesia, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
V. M. Gazeev
Affiliation:
Institute of Geology of Ore Deposits, Geochemistry, Mineralogy and Petrography (IGEM) RAS, Staromonetny 35, Moscow, Russia
N. N. Pertsev
Affiliation:
Institute of Geology of Ore Deposits, Geochemistry, Mineralogy and Petrography (IGEM) RAS, Staromonetny 35, Moscow, Russia
P. Dzierżanowski
Affiliation:
Institute of Geochemistry, Mineralogy and Petrology, Warsaw University, al. Żwirki i Wigury 93, 02-089 Warszawa, Poland
*
* E-mail: irina.galuskina@us.edu.pl
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Abstract

Irinarassite, Ca3Sn2SiAl2O12, a new mineral species of the garnet supergroup was discovered in metasomatically altered carbonate-silicate xenoliths in ignimbrites of the Upper Chegem Caldera, Northern Caucasus, Kabardino-Balkaria, Russia. It occurs as small zones and irregular spots in kimzeyite-kerimasite or rarely as single crystals not exceeding 10 μm in size, within complex pseudomorphs after zircon. Lakargiite, tazheranite, baddeleyite, kerimasite, kimzeyite, baghdadite and rarely magnesioferrite are associated with irinarassite in the pseudomorphs which are confined to larnite-cuspidine zones immediately adjoining the ignimbrite. Larnite, cuspidine, rondorfite, fluor- and hydroxylellestadite, fluorite and secondary minerals such as ettringite, hillebrandite and bultfonteinite are associated with irinarassite. Irinarassite is pale brown to yellow colour. The mineral is characterized by the absence of cleavage and by an irregular fracture. The calculated density is 4.3 g cm–1. The mineral is isotropic with a calculated refractive index of 1.9. The empirical crystal chemical formula of irinarassite from the holotype specimen is as follows (Ca2.965Fe2+0.035)Σ3(Sn1.016Zr0.410Ti0.262Sb5+0.237Fe2+0.035U6+0.017Sc0.014Hf0.006Nb0.004)Σ2.001(Al1.386Fe3+0.804Si0.446Ti4+0.364)Σ3O12. Electron backscatter diffraction patterns of irinarassite are fitted to the garnet model with a = 12.50(3) Å with excellent MAD (mean angular deviation) = 0.16°. The Raman spectrum of irinarassite is analogous to those of kerimasite and other Zr-Sn-garnets of the schorlomite and bitikleite groups.

Keywords

irinarassitegarnet supergroupSnEBSDRamantazheranitemetasomatic rocksUpper-Chegem Caldera
Type
Research Article
Information
Mineralogical Magazine , Volume 77 , Issue 6 , August 2013 , pp. 2857 - 2866
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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