HRTEM observations of structural and chemical modulations in cosalite and its relationship to the lillianite homologues

A. Pring, B. Etschmann

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The results of a HRTEM and electron diffraction investigation of a Cu- and Ag-rich cosalite, pairs of satellite reflections at Gp ± ~ 1 8[140]* and Gp ± ~ 1 8[1̄40]* in addition to the strong Bragg reflections of the underlying average structure. The superlattice corresponds to a compositional and displacive modulation G ± qpnm where qpnm is the primary modulation vector 1 8[140]*. The superlattice is attributed to coupled Ag Pb Bi and Cu □ ordering and associated structural relaxation. The HRTEM images show a complex moire texture due to the structural modulations. Cosalite from Ivigtut, Greenland, also forms coherent intergrowths with members of the lillianite gustavite series (Pb3Bi2S6 PbAgBi3S6). A model for the intergrowth between the structures is presented based on sharing both S and Pb atoms in the PbS-like slabs in both structures along [010] cosalite.

Original languageEnglish
Pages (from-to)451-458
Number of pages8
JournalMineralogical Magazine
Volume66
Issue number3
DOIs
Publication statusPublished - 1 Jul 2002
Externally publishedYes

Keywords

  • Cosalite
  • Electron diffraction
  • Greenland
  • HRTEM
  • Ivigtut
  • Lillianite

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