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‘Clinobarylite’–barylite: order-disorder relationships and nomenclature

Published online by Cambridge University Press:  02 January 2018

Stefano Merlino
Affiliation:
Dipartimento di Scienze della Terra, Universita` di Pisa, Via Santa Maria 53, 56126 Pisa, Italy
Cristian Biagioni*
Affiliation:
Dipartimento di Scienze della Terra, Universita` di Pisa, Via Santa Maria 53, 56126 Pisa, Italy
Elena Bonaccorsi
Affiliation:
Dipartimento di Scienze della Terra, Universita` di Pisa, Via Santa Maria 53, 56126 Pisa, Italy
Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia
Igor V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobyovy Gory, Moscow, 119991, Russia
Sergey V. Krivovichev
Affiliation:
Department of Crystallography, Geological Faculty, Saint-Petersburg State University, University Emb. 7/9, St. Petersburg, 199034, Russia
Viktor N. Yakovenchuk
Affiliation:
Nanomaterials Research Centre, Kola Science Centre of the Russian Academy of Sciences, 14 Fersman Street, . Apatity 184200, Murmansk Region, Russia
Thomas Armbruster
Affiliation:
Mineralogical Crystallography, Institute of Geological Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland

Abstract

'Clinobarylite', BaBe2Si2O7, was defined as a monoclinic dimorph of orthorhombic barylite. Subsequently, its crystal structure was also proved to be orthorhombic, differing from barylite in terms of the space group symmetry, Pmn21 instead of Pmnb, and in unit-cell dimensions. Through the order-disorder (OD) theory, the polytypic relationships between 'clinobarylite' and barylite are described. 'Clinobarylite' corresponds to the MDO1 polytype, with unit-cell parameters a = 11.650, b = 4.922, c = 4.674 Å, space group Pmn21; barylite corresponds to the MDO2 polytype, with a = 11.67, b = 9.82, c = 4.69 Å, space group Pmnb. The re-examination of the holotype specimen of 'clinobarylite' confirmed its orthorhombic symmetry. Its crystal structure has been refined starting from the atomic coordinates calculated for the MDO1 polytype and the refinement converged to R1 = 0.0144 for 929 observed reflections [Fo > 4σFo]. Owing to their polytypic relationships, 'clinobarylite' and barylite should be conveniently indicated as barylite-1O and barylite-2O, respectively; the name 'clinobarylite' should be discontinued. This new nomenclature of the barylite polytypes has been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA 13-E).

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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