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Structure of Sr-Zr-bearing perrierite-(Ce) from the Burpala Massif, Russia

Published online by Cambridge University Press:  05 July 2018

Marcin Stachowicz*
College of Inter-Faculty Individual Studies in Mathematics and Natural Sciences (MISMaP), Żwirki i Wigury 93, 02-089 Warsaw, Poland Biological and Chemical Research Centre, Chemistry Department, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland
Bogusław Bagiński
Institute of Geochemistry, Mineralogy and Petrology, University of Warsaw, 02-089, Żwirki i Wigury 93, Warsaw, Poland
Ray Macdonald
Institute of Geochemistry, Mineralogy and Petrology, University of Warsaw, 02-089, Żwirki i Wigury 93, Warsaw, Poland
Pavel M. Kartashov
Institute of Geology of Ore Deposits, Mineralogy, Petrology and Geochemistry, Russian Academy of Sciences, RU-109017 Moscow, Russia
Artur OzięBło
Institute of Ceramics and Building Materials, Poste˛pu 9, 02-676, Warsaw, Poland
Krzysztof Wożniak
Biological and Chemical Research Centre, Chemistry Department, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland


Sr- and Zr-bearing perrierite-(Ce) occurring in aegirinized syenite pegmatites of the Burpala massif, Russia, is compositionally intermediate between perrierite-(Ce) and hezuolinite and occupies a compositional gap in minerals of the chevkinite group. Its crystal structure has been determined using a single-crystal diffractometer fitted with a CCD detector and MoKα X-ray radiation. The mineral is monoclinic; a = 13.815(1), b = 5.668(1), c = 11.842(1) Å , β = 113.843(3)º, V = 848.18(4) Å3, space group C2/m, Z = 2. The crystal structure was refined with the occupancies [(Ce1.2La1.0Nd0.15) (Sr1.0Ca0.5Na0.15)]4(Zr0.5Fe0.3Mn0.2)(Ti1.3Fe0.7)2Ti2(Si2O7)2O8 on the basis of chemical composition although the allocation of cations to particular sites was performed on the basis of the number of refined electrons in each unique site. The dominance of Zr in the B site links the Burpala perrierite-(Ce) to more Sr-Zr-rich members of the chevkinite group, such as hezuolinite and rengeite. As in all of the perrierite members, there is a distortion of the D site octahedra, which is interpreted as due to the packing of the REE ions.

Research Article
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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