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American Mineralogist; January 2007; v. 92; no. 1; p. 109-113; DOI: 10.2138/am.2007.2276
© 2007 Mineralogical Society of America
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Single-crystal elastic properties of Ca0.07Mg1.93Si2O6 orthopyroxene

Jean-Philippe Perrillat1,*, Fabrizio Nestola2,{dagger}, Stanislav V. Sinogeikin1 and Jay D. Bass1

1 Department of Geology, University of Illinois, Urbana, Illinois 61801, U.S.A.
2 Bayerisches Geoinstitut, Universitat Bayreuth, 95440 Bayreuth, Germany

Correspondence: * E-mail: jperrill{at}uiuc.edu

The single-crystal elastic properties of Ca0.07Mg1.93Si2O6 orthopyroxene (space group Pbca) have been investigated by Brillouin spectroscopy at ambient conditions. The aggregate bulk and shear moduli, K0,S = 102.5 GPa (1.5) and µ = 74.2 GPa (1.1), respectively, are ~5% and ~3% lower than commonly accepted values for MgSiO3 end-member (K0,S = 107.6, µ = 76.8 GPa). These results indicate that the incorporation of small amount of Ca in the orthoenstatite structure does not greatly affect its elastic properties. As a consequence, the increase in bulk modulus reported in natural orthopyroxenes relative to the Mg-end-member is not related to the substitution of Ca in the M2 octahedral sites, but more probably to the substitution of Al in tetrahedral sites.

Key Words: Brillouin spectroscopy • elastic properties • enstatite • orthopyroxene




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J. M. Jackson, E. A. Hamecher, and W. Sturhahn
Nuclear resonant X-ray spectroscopy of (Mg,Fe)SiO3 orthoenstatites
European Journal of Mineralogy, June 1, 2009; 21(3): 551 - 560.
[Abstract] [Full Text] [PDF]


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