Model pyroxenes I: Ideal pyroxene topologies

Richard M. Thompson, Robert T. Downs

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


Ideal pyroxenes are hypothetical structures based on ideal closest-packed arrangements of O anions. They are modeled after observed pyroxene structures and have the general formula M2MIT2O6, where M2 and M1 represent octahedrally coordinated cations, and T represents tetrahedrally coordinated cations. An algorithm has been created to construct all possible ideal pyroxenes based on closest-packed stacking sequences of length 12 or less. These structures are reported. The only significant structural parameters that vary between different ideal pyroxenes are the M1-T and M2-T distances. We show that the repulsive forces between these pairs of cations distinguishes the energetics of the ideal pyroxenes and may be important in determining the topologies of observed pyroxenes.

Original languageEnglish (US)
Pages (from-to)653-666
Number of pages14
JournalAmerican Mineralogist
Issue number4
StatePublished - Apr 2003

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology


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