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GEOREF RECORD

High temperature single crystal investigation in a clinopyroxene of composition (Na (sub 0.5) Ca (sub 0.5) )(Cr (sub 0.5) Mg (sub 0.5) )Si (sub 2) O (sub 6)

Mario Tribaudino, Fabrizio Nestola and Haruo Ohashi
High temperature single crystal investigation in a clinopyroxene of composition (Na (sub 0.5) Ca (sub 0.5) )(Cr (sub 0.5) Mg (sub 0.5) )Si (sub 2) O (sub 6) (in EMPG X; Experimental mineralogy, petrology and geochemistry, A. B. Woodland (editor) and S. F. Foley (editor))
European Journal of Mineralogy (April 2005) 17 (2): 297-304

Abstract

The spectrum of a synthetic clinopyroxene of composition (Na (sub 0.5) Ca (sub 0.5) )(Cr (sub 0.5) Mg (sub 0.5) )Si (sub 2) O (sub 6) was investigated at room and high temperature. At room temperature, a high resolution data collection was done; at high temperature, data was collected up to 2theta < or = 50 degrees and at T = 25, 200, 400 and 620 degrees C. The observed symmetry was always C2/c, and no evidence of a reduction to the long range ordered P2 (sub 1) /n symmetry was found. The presence of local clusters of NaCr and CaMg pairs is suggested. Comparison with the high-temperature evolution of diopside, kosmochlor and jadeite shows a significant decrease in volume expansion with the coupled NaM (super 3+) substitution for CaMg. This is mainly due to a decrease in 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 greater stiffness of the O1A1-O1B1 shared edge between the M1 polyhedra.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 17
Serial Issue: 2
Title: High temperature single crystal investigation in a clinopyroxene of composition (Na (sub 0.5) Ca (sub 0.5) )(Cr (sub 0.5) Mg (sub 0.5) )Si (sub 2) O (sub 6)
Title: EMPG X; Experimental mineralogy, petrology and geochemistry
Author(s): Tribaudino, MarioNestola, FabrizioOhashi, Haruo
Author(s): Woodland, A. B.editor
Author(s): Foley, S. F.editor
Affiliation: Universita di Torino, Dipartimento di Scienze Mineralogiche e Petrologiche, Turin, Italy
Pages: 297-304
Published: 200504
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: 10th international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Frankfurt, DEU, Federal Republic of Germany
Meeting date: 20040404April 4-7, 2004
References: 45
Accession Number: 2005-041703
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Secondary Affiliation: Universitaet Bayreuth, DEU, Federal Republic of GermanyHashi Institute for Silicate Science, JPN, Japan
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200525
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