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European Journal of Mineralogy; March, April 2005; v. 17; no. 2; p. 297-304; DOI: 10.1127/0935-1221/2005/0017-0297
© 2005 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

High temperature single crystal investigation in a clinopyroxene of composition (Na0.5Ca0.5)(Cr0.5Mg0.5)Si2O6

Mario TRIBAUDINO1,*, Fabrizio NESTOLA2 and Haruo OHASHI3

1 Dipartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, Via Valperga Caluso 35, I-10125 Torino, Italy, Dipartimento di Scienze della Terra, Parco Area delle Scienze 157/A, Università degli Studi di Parma, I-43100 Parma, Italy.
2 Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
3 Hashi Institute for Silicate Science, Nishinakanobu 1-9-25, Shinagawa, Tokyo 142-0054, Japan

* E-mail: mario.tribaudino{at}unito.it

The structure of a synthetic clinopyroxene of composition (Na0.5Ca0.5)(Cr0.5Mg0.5)Si2O6 was investigated at room and high temperature. At room temperature a high resolution data collection (2{theta} ≤ 110°) was done; at high temperature the data were collected up to 2{theta} ≤ 50° and at T = 25, 200, 400 and 620°C.

The observed symmetry was always C2/c, and no evidence of a reduction to the long range ordered P21/n symmetry was found. The analysis of the evolution of the Beq vs T suggests instead the presence of local clustering of NaCr and CaMg pairs.

A comparison with the high temperature behaviour of diopside, kosmochlor and jadeite shows a significant decrease in volume expansion with the coupled NaM3+ substitution for CaMg. This is mainly due to a decrease in the expansion along the b axis, and is related to a smaller expansion in the M1 polyhedron for the substitution of a trivalent cation in the M1 site and to the consequent higher stiffness of the O1A1 - O1B1 shared edge between the M1 polyhedra.

Key-words: crystal structure, clinopyroxene, diopside-kosmochlor, average structure, thermal expansion.




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