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The modular structure of pyroxenes

Massimo Nespolo and Mois I. Aroyo
The modular structure of pyroxenes
European Journal of Mineralogy (2015) 28 (1): 189-203


The structures of pyroxenes can be described as cell-twins based on a common module (a layer) consisting of half the unit cell of the P2 (sub 1) /c polymorph. Atomic models of the different polymorphs are computed and the close similarity between the models and the corresponding experimental structures is shown. The cell-twin operations building the structures of pyroxenes are partial operations belonging to a special case of space groupoid which was called "twinned space group" in the pioneering studies by Ito started in 1935. The groupoid analysis of clino-, proto- and orthoenstatite is presented and the special place occupied by pyroxenes in the category of polytypes is discussed.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 28
Serial Issue: 1
Title: The modular structure of pyroxenes
Affiliation: Kyoto University, Department of Geology and Mineralogy, Kyoto, Japan
Pages: 189-203
Published: 2015
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 43
Accession Number: 2016-016547
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 9 tables
Secondary Affiliation: Universidad del Pais Vasco, ESP, Spain
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute.
Update Code: 201609
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