Tremolite-richterite amphiboles: synthesis, compositional and structural characterization, and thermochemistry

A. R. Pawley, C. M. Graham, A. Navrotsky

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

The substitution NaNa□-1Ca-1, which fills the A site, has been investigated in amphiboles close to the join tremolite-richterite. At 1123 K, compositions of amphiboles synthesized from bulk compositions on this binary are displaced towards magnesio-cummingtonite [Mg7Si8O22(OH)2], such that average compositions are better represented by the pseudobinary tremolite92magnesio-cummingtonite8-richterite. Major-element compositions and H2O contents are close to theoretical values for eight samples synthesized along this join. Unit-cell parameters vary smoothly with composition, a sin β showing the greatest increase as Na fills the A site. High-resolution transmission electron microscopy demonstrates that the amphiboles are highly ordered, with only the tremolite-rich compositions containing any chain multiplicity faults. -from Authors

Original languageEnglish (US)
Pages (from-to)23-35
Number of pages13
JournalAmerican Mineralogist
Volume78
Issue number1-2
StatePublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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