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Cu0.8Mg1.2Si2O6 : a copper-bearing silicate with the low-clinopyroxene structure

Published online by Cambridge University Press:  02 January 2018

Lei Ding
Affiliation:
Université Grenoble Alpes, Institut Néel, Grenoble, 38042, France CNRS, Institut Néel, Grenoble, 38042, France
Céline Darie
Affiliation:
Université Grenoble Alpes, Institut Néel, Grenoble, 38042, France CNRS, Institut Néel, Grenoble, 38042, France
Claire V. Colin
Affiliation:
Université Grenoble Alpes, Institut Néel, Grenoble, 38042, France CNRS, Institut Néel, Grenoble, 38042, France

Abstract

The Cu0.8Mg1.2Si2O6 pyroxene has been synthesized using a soft chemistry method. Its crystal structure was determined from powder X-ray diffraction data. Cu0.8Mg1.2Si2O6 crystallizes with the lowclinopyroxene monoclinic structure (space group P21/c). The role of the Jahn-Teller-distorted Cu2+ cation on the stability of this strongly distorted structure is investigated. Cu2+ shows a strong preference for the M2 site, attributed to a better adaptation of its JT-distorted coordination polyhedron to this already distorted and more flexible site. Comparison with previously reported compounds indicates that increasing the Cu content enhances the M2 site distortion, eventually leading to symmetry lowering from orthorhombic Pbca to monoclinic P21/c. These observations bring new insight into the mechanisms of formation and chemical composition of pyroxene minerals in the presence of JT cations.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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