The structure of antimonian dussertite and the role of antimony in oxysalt minerals

U. Kolitsch, P. G. Slade, E. R.T. Tiekink, A. Pring

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The structure of antimonian dussertite, Ba(Fe0.843+,Sb0.165+)3(AsO4)2(OH,H2O)6, has been refined in space group R3m with a 7.410(3), c 17.484(4) Å, Z = 3, to R = 3.2 % and RW = 3.7 % using 377 observed reflections with I ≥ 3 σ(I). The structure is of the alunite-type and consists of sheets of corner-sharing (Fe3+,Sb5+)O6 octahedra parallel to (0001). The substitution of Sb5+ for Fe3+, and not for As5+, is unambiguously demonstrated not only by the structure refinement but also by electron microprobe analyses and crystal-chemical considerations. The icosahedrally coordinated Ba cations occupy cavities between pairs of octahedral sheets and are surrounded by six O atoms from the AsO4 tetrahedra and six O atoms from the (Fe3+, Sb5+)O6 octahedra. The mean bond lengths for the various coordination polyhedra are As-O 1.684(3) Å, (Fe,Sb)-O 2.004(1) Å, and Ba-O 2.872(2) Å. A hydrogen-bonding network is modelled using bond-valence calculations. The dussertite sample investigated is the first member of the crandallite group found to contain substantial Sb.

Original languageEnglish
Pages (from-to)17-26
Number of pages10
JournalMineralogical Magazine
Volume63
Issue number1
DOIs
Publication statusPublished - 1 Feb 1999
Externally publishedYes

Keywords

  • Antimony
  • Crandallite group
  • Crystal chemistry
  • Crystal structure
  • Dussertite

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