Single-crystal elasticity of zoisite Ca2Al3 Si3O12(OH) by Brillouin scattering

Zhu Mao, Fuming Jiang, Thomas S. Duffy

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The single-crystal elastic constants of zoisite Ca2Al3Si3O12(OH) were determined by Brillouin scattering at ambient conditions. The elastic tensor was obtained by an inversion of acoustic velocity data for three different crystal planes. The aggregate bulk modulus, shear modulus, and Poisson's ratio are KS0 = 125.3(4) GPa, G0 = 72.9(2) GPa, and σ0 = 0.26(1) for the VRH (Voigt-Reuss-Hill) average, respectively. The maximum azimuthal anisotropy of zoisite is 22% for compressional velocity and 33% for shear velocity. The maximum shear splitting is 21% along the [001] direction. Our results resolve the discrepancies in bulk modulus and axial compressibilities reported from static compression studies, and provide the first experimental constraints on the shear modulus. Trends in the elastic moduli of minerals in the CaO-Al2O3- SiO2-H2O (CASH) system are evaluated.

Original languageEnglish (US)
Pages (from-to)570-576
Number of pages7
JournalAmerican Mineralogist
Volume92
Issue number4
DOIs
StatePublished - Apr 1 2007

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Keywords

  • Brillouin scattering
  • Elasticity
  • Single crystal
  • Zoisite

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