Contributions to Mineralogy and Petrology

, Volume 48, Issue 2, pp 137–148

The energetics of natural garnet solid solution

I. Mixing of the aluminosilicate end-members
  • Jibamitra Ganguly
  • George C. Kennedy
Article

DOI: 10.1007/BF00418615

Cite this article as:
Ganguly, J. & Kennedy, G.C. Contr. Mineral. and Petrol. (1974) 48: 137. doi:10.1007/BF00418615

Abstract

Approximate mixing properties of the end-member components of the quarternary garnet solid solution, (Fe,Mg,Ca,Mn)3Al2Si3O12, have been derived through theoretical analysis of observational data, combined with certain experimental results and crystal chemical considerations. The results suggest that the mixing of pyrope with grossularite, spessartite, and almandine would involve significant positive excess free energies of mixing leading to the critical mixing temperatures of 694±55, 535±140, and 479±63 °C respectively. Spessartite would mix with almandine nearly ideally, and with grossularite with small positive deviation from ideality. The quarternary solution reduces essentially to a ternary mixture of pyrope, grossularite, and almandine + spessartite. The solid solubility relation, and tie line coordinates in this ternary system has been calculated as a function of temperature; the solid solution is found to be intrinsically stable for practically all ternary compositions at 600 °C.

Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • Jibamitra Ganguly
    • 1
  • George C. Kennedy
    • 1
  1. 1.Institute of Geophysics and Planetary PhysicsUniversity of CaliforniaLos AngelesUSA

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