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GEOREF RECORD

The crystal structure of natural Fe-rich chevkinite-(Ce)

Yang Zhuming, Michel Fleck, Martin Smith, Tao Kejie, Song Renkui and Zhang Peishan
The crystal structure of natural Fe-rich chevkinite-(Ce)
European Journal of Mineralogy (October 2002) 14 (5): 969-975

Abstract

The chemical composition and crystal structure of non-metamict Fe-rich chevikinite-(Ce) from an aegirine alkali granite, Mianning, Sichuan Province, China, was investigated. EPMA showed FeO(tot) ranges from 10.97 to 11.59 wt.% and Ce (sub 2) O (sub 3) from 23 to 25%. There are deficient A- and (B + C)-type cations in the formula. The structure was refined in space group C2/m to R 2.41%; a 13.456, b 5.728, c 11.083 Aa, beta 100.60 degrees , V 839.7 Aa (super 3) , Z = 2. The structure consists of two kinds of sheets: one a sheet of Si (sub 2) O (sub 7) groups and B octahedra, and the other a sheet of C octahedra, both the ab plane. These two kinds of sheets alternate along the c axis and form a 3D framework. The REE ions lie between the disilicate groups and the sheets of octahedra to form (8 + 3)-coordinated A1 polyhedra and 10-coordinated A2 polyhedra. The Fe and Ti are partially ordered among the octahedral sites of B, C1, C2A and C2B. Charge distribution analysis confirms Fe (super 3+) /Sigma Fe = 0.61 and a mixture of Fe (super 2+) and Fe (super 3+) in the B site.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 14
Serial Issue: 5
Title: The crystal structure of natural Fe-rich chevkinite-(Ce)
Affiliation: Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing, China
Pages: 969-975
Published: 200210
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 15
Accession Number: 2002-071658
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 8 tables
N26°00'00" - N34°10'00", E97°30'00" - E108°25'00"
Secondary Affiliation: Vienna University, AUT, AustriaNatural History Museum, GBR, United Kingdom
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200222
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