A calorimetric study of synthetic amphiboles along the tremolite- tschermakite join and the heats of formation of magnesiohornblende and tschermakite

E. A. Smelik, D. M. Jenkins, A. Navrotsky

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

A suite of synthetic calcic amphiboles in the tremolite-tschermakite series has been studied by high-temperature drop-solution calorimetry in molten 2PbO.B2O/3O. The pseudobinary join, which is shifted toward magnesiocummingtonite by 10 mol%, extends from tremolite to magnesiohornblende, and represents the operation of one full Mg-Tschermak substitution into the tremolite formula. The calorimetric measurements indicate that the energy change associated with one full Mg-Tschermak substitution is quite small, on the order of -5 to -10 kJ/mol. Enthalpies of formation from the elements at 298.15 K and 1 bar have been calculated using the new calorimetric data for the magnesiohornblende and tschermakite end-members. -from Authors

Original languageEnglish (US)
Pages (from-to)1110-1122
Number of pages13
JournalAmerican Mineralogist
Volume79
Issue number11-12
StatePublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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