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Megawite, CaSnO3: a new perovskite-group mineral from skarns of the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia

Published online by Cambridge University Press:  05 July 2018

E. V. Galuskin ,
I. O. Galuskina ,
V. M. Gazeev ,
P. Dzierżanowski ,
K. Prusik ,
N. N. Pertsev ,
A. E. Zadov ,
R. Bailau  and
A. G. Gurbanov
E. V. Galuskin*
Affiliation:
Department of Geochemistry, Mineralogy and Petrography, Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41–200 Sosnowiec, Poland
I. O. Galuskina
Affiliation:
Department of Geochemistry, Mineralogy and Petrography, Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41–200 Sosnowiec, Poland
V. M. Gazeev
Affiliation:
Institute of the Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry (IGEM) RAS, Staromonetny 35, Moscow, Russia
P. Dzierżanowski
Affiliation:
Institute of Geochemistry, Mineralogy and Petrology, University of Warsaw, al. Żwirki i Wigury 93, 02–089 Warsaw, Poland
K. Prusik
Affiliation:
Institute of Materials Science, University of Silesia, Bankowa 12, 40–007 Katowice, Poland
N. N. Pertsev
Affiliation:
Institute of the Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry (IGEM) RAS, Staromonetny 35, Moscow, Russia
A. E. Zadov
Affiliation:
OOO Science Research Centre ‘NEOCHEM’, Dmitrovskoye Highway 100/2, Moscow, Russia
R. Bailau
Affiliation:
Department of Geochemistry, Mineralogy and Petrography, Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41–200 Sosnowiec, Poland
A. G. Gurbanov
Affiliation:
Institute of the Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry (IGEM) RAS, Staromonetny 35, Moscow, Russia
*
*E-mail: [email protected]
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Abstract

Megawite is a perovskite-group mineral with an ideal formula CaSnO3 that was discovered in altered silicate-carbonate xenoliths in the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus. Russia. Megawite occurs in ignimbrite, where it forms by contact metamorphism at a temperature >800°C and low pressure. The name megawite honours the British crystallographer Helen Dick Megaw (1907—2002) who did pioneering research on perovskite-group minerals. Megawite is associated with spurrite, reinhardbraunsite, rondorfite, wadalite, srebrodolskite, lakargiite, perovskite, kerimasite. elbrusite-(Zr), periclase, hydroxylellestadite, hydrogrossular, ettringite-group minerals, afwillite. hydrocalumite and brucite. Megawite forms pale yellow or colourless crystals up to 15 urn on edge with pseudo-cubic and pseudo-cuboctahedral habits. The calculated density and average refractive index are 5.06 g cm–3 and 1.89, respectively. Megawite is Zr-rich and usually crystallizes on lakargiite. CaZrO3. The main bands in the Raman spectrum of megawite are at: 159, 183, 262, 283, 355, 443. 474, 557 and 705 cm–1. The unit-cell parameters and space group of megawite, derived from electron back scattered diffraction, are: a = 5.555(3), b = 5.708(2), c = 7.939(5) Å, V = 251.8(1) Å3, Pbnm, Z = 4; they are based on an orthorhombic structural model for the synthetic perovskite CaSn0.6Zr0.4O3.

Keywords

megawiteCaSnO3lakargiiteperovskiteRaman spectroscopyEBSDLakargi mountainRussia
Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 5 , October 2011 , pp. 2563 - 2572
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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