Physics and Chemistry of Minerals

, Volume 21, Issue 5, pp 344–349 | Cite as

Comparative compressibilities of majorite-type garnets

  • R. M. Hazen
  • R. T. Downs
  • P. G. Conrad
  • L. W. Finger
  • T. Gasparik
Article

Abstract

Relative compressibilities of five silicate garnets were determined by single-crystal x-ray diffraction on crystals grouped in the same high-pressure mount. The specimens include a natural pyrope [(Mg2.84Fe0.10Ca0,06) Al2Si3O12], and four synthetic specimens with octahedrally-coordinated silicon: majorite [Mg3(MgSi)Si3O12], calcium-bearing majorite [(Ca0.49Mg2.51)(MgSi)Si3012], sodium majorite [(Na1.88Mgp0.12)(Mg0.06Si1.94)Si3O12], and an intermediate composition [(Na0.37Mg2.48)(Mg0.13Al1.07 Si080) Si3O12]. Small differences in the compressibilities of these crystals are revealed because they are subjected simultaneously to the same pressure. Bulk-moduli of the garnets range from 164.8 ± 2.3 GPa for calcium majorite to 191.5 ± 2.5 GPa for sodium majorite, assuming K′=4. Two factors, molar volume and octahedral cation valence, appear to control garnet compression.

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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • R. M. Hazen
    • 1
  • R. T. Downs
    • 1
  • P. G. Conrad
    • 1
  • L. W. Finger
    • 1
  • T. Gasparik
    • 2
  1. 1.Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of WashingtonWashington, DCUSA
  2. 2.Department of Earth and Space SciencesState University of New YorkStony BrookUSA

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