Geology of Ore Deposits

, Volume 52, Issue 7, pp 656–661 | Cite as

Aktashite Cu6Hg3As4S12 from the Aktash deposit, Altai, Russia: Refinement and crystal chemical analysis of the structure

  • V. I. Vasil’ev
  • N. V. Pervukhina
  • S. V. Borisov
  • S. A. Magarill
  • D. Yu. Naumov
  • N. V. Kurat’eva
Mineralogical Crystallography and Crystal Chemistry

Abstract

The composition and structure of aktashite from the Aktash deposit, Gorny Altai, Russia, have been studied by electron microprobe and X-ray structural analysis. On the basis of close compositions and crystal structures, the identity of aktashite from the Gal-Khaya and Aktash deposits has been demonstrated. Crystals of aktashite are of trigonal symmetry; the unit-cell dimensions are: a = 13.7500(4), c = 9.3600(3) Å, V = 532.54(8) Å3, space group R3, Z = 3 for the composition of Cu6Hg3As4S12, R = 0.043. The structure of aktashite as a framework of vertex-shared HgS4− and CuS4− tetrahedrons of the same orientation is intimately related to the sphalerite-type structure. The earlier identified uncommon cluster group [As4] has been verified and its parameters have been refined. It is shown that the structure may be represented as construction blocks (As4S12)12− packed according to the law of the distorted cubic I-cell.

Keywords

Vasil Electron Microprobe Polysulfide Unit Cell Dimension Trigonal Symmetry 

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Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  • V. I. Vasil’ev
    • 1
  • N. V. Pervukhina
    • 2
  • S. V. Borisov
    • 2
  • S. A. Magarill
    • 2
  • D. Yu. Naumov
    • 2
  • N. V. Kurat’eva
    • 2
  1. 1.Institute of Geology and Mineralogy, Siberian BranchRussian Academy of SciencesNovosibirskRussia
  2. 2.Institute of Inorganic Chemistry, Siberian BranchRussian Academy of SciencesNovosibirskRussia

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