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Synthesis and crystal structure of C2/c Ca(Co,Mg)Si2O6 pyroxenes: effect of the cation substitution on cell volume

Published online by Cambridge University Press:  02 January 2018

C. Gori ,
M. Tribaudino ,
L. Mantovani ,
G. D. Gatta ,
D. Delmonte ,
E. Gilioli ,
F. Mezzadri  and
G. Calestani
C. Gori*
Affiliation:
Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale. Plesso di Scienze Geologiche, Università degli Studi di Parma, Parco Area delle Scienze 157/A, 43124, Parma, Italy
M. Tribaudino
Affiliation:
Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale. Plesso di Scienze Geologiche, Università degli Studi di Parma, Parco Area delle Scienze 157/A, 43124, Parma, Italy
L. Mantovani
Affiliation:
Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale. Plesso di Scienze Geologiche, Università degli Studi di Parma, Parco Area delle Scienze 157/A, 43124, Parma, Italy
G. D. Gatta
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, I-20133 Milano, Italy
D. Delmonte
Affiliation:
Istituto dei Materiali per l’Elettronica ed il Magnetismo-Consiglio Nazionale delle Ricerche (IMEM-CNR), 43124 Parma, Italy
E. Gilioli
Affiliation:
Istituto dei Materiali per l’Elettronica ed il Magnetismo-Consiglio Nazionale delle Ricerche (IMEM-CNR), 43124 Parma, Italy
F. Mezzadri
Affiliation:
Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale. Plesso di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 11/A, 43124, Parma, Italy
G. Calestani
Affiliation:
Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale. Plesso di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 11/A, 43124, Parma, Italy
*
*E-mail: [email protected]
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Abstract

A series of clinopyroxenes along the CaMgSi2O6–CaCoSi2O6 join was synthesized by quenching from melts at 1500°C and subsequent annealing at 1250°C (at 0.0001 GPa). This protocol proved to be the most effective to obtain homogenous, impurity-free and stoichiometric pyroxenes. Electron microprobe analyses in energy dispersive mode were conducted and single-crystal X-ray diffraction data were collected on Ca (CoxMg1-x)Si2O6 pyroxenes with x = 0.2, 0.4, 0.5, 0.6. Effects of cation substitution at the M1 site are described. The experimental findings of this study allow us to extend the comparative analysis of the structural features of pyroxenes with divalent cations at the M1 and M2 sites.

Keywords

pyroxenecobaltsite substitutioncrystal chemistry
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 5 , October 2017 , pp. 1129 - 1139
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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