Structure of lengenbachite: a high-resolution transmission electron microscope study

T. B. Williams, A. Pring

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High-resolution transmission electron microscopy and electron diffraction have been used to examine the structure of lengenbachite, of approximate composition Pb6As4(Ag,Cu)2 S13. The structure deduced consists of a semicommensurate intergrowth of a pseudotetragonal layer (T), a sheared four-atom-thick {100} PbS-like slice, and a slightly distorted five-atom-thick pseudo-orthohexagonal {111} M2S3 slice (O). Both layer types contain Pb and As atoms in cation sites, giving layer stoichiometries of T = (PB,As)4S4 and O = (As,Pb)2S3. The structure is in agreement with the cell geometries and compositions proposed by earlier workers. The relationships with the structures of cylindrite and "franckeites' are also discussed. -Authors

Original languageEnglish
Pages (from-to)1426-1433
Number of pages8
JournalAmerican Mineralogist
Issue number11-12
Publication statusPublished - 1 Jan 1988
Externally publishedYes

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