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Biraite-(Ce), Ce (sub 2) Fe (super 2+) (CO (sub 3) )(Si (sub 2) O (sub 7) ), a new mineral from Siberia with a novel structure type

Alexey Konev, Marco Pasero, Dmitry Pushcharovsky, Stefano Merlino, Anvar Kashaev, Ludmila Suvorova, Zinaida Ushchapovskaya, Nadezda Nartova, Yulia Lebedeva and Nikita Chukanov
Biraite-(Ce), Ce (sub 2) Fe (super 2+) (CO (sub 3) )(Si (sub 2) O (sub 7) ), a new mineral from Siberia with a novel structure type
European Journal of Mineralogy (October 2005) 17 (5): 715-721

Abstract

Biraite-(Ce) occurs in the Biraia carbonatite dyke, Irkutsk district, Russia, associated with cordylite-(Ce) and -(La), aragonite, strontianite, Sr,Fe-bearing dolomite, ancylite-(Ce) and -(La), hydroxyl-bastnaesite-(Ce), daqingshanite-(Ce) and a host of other minerals. It occurs as irregular to well-shaped grains from 0.1 to 3 mm in length, and is brown with a vitreous lustre; H.5, D (sub calc) 4.76 g/cm (super 3) ; alpha 1.785, beta 1.810, gamma 1.820, 2Valpha 66 degrees ; dispersion r < v, weak. TG, DTA and DTG curves are presented. A combination of EPMA and wet chemical analyses led to the simplified formula Ce (sub 2) Fe (super 2+) (CO (sub 3) )(Si (sub 2) O (sub 7) ); the IR spectrum confirmed the presence of CO (sub 3) groups. Indexed XRD powder data are tabulated; strongest lines 2.92(10), 3.30(5), 2.65(5), 2.23(5), 4.41(4), 3.61(4),3.14(4) Aa; a 6.505, b 6.744, c 18.561 Aa, beta 108.75 degrees , V 771.1 Aa (super 3) , Z = 4, space group P2 (sub 1) /c. The crystal structure was refined to R 0.033; it is a new structure type based on polyhedral (001) sheets composed of pairs of edge-sharing [FeO (sub 6) ] octahedra, [Si (sub 2) O (sub 7) ] groups and [CO (sub 3) ] triangles. Ce (super 3+) cations in ten-fold coordination provide the linkage between neighbouring polyhedral sheets.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 17
Serial Issue: 5
Title: Biraite-(Ce), Ce (sub 2) Fe (super 2+) (CO (sub 3) )(Si (sub 2) O (sub 7) ), a new mineral from Siberia with a novel structure type
Affiliation: Russian Academy of Sciences, Siberian Branch, Institute of the Earth's Crust, Irkutsk, Russian Federation
Pages: 715-721
Published: 200510
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 8
Accession Number: 2005-074503
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
Secondary Affiliation: Universita di Pisa, ITA, ItalyMoscow State University, RUS, Russian Federation
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200544
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