Geology of Ore Deposits

, Volume 59, Issue 7, pp 652–661 | Cite as

Crystal Chemistry of Pyroaurite from the Kovdor Pluton, Kola Peninsula, Russia, and the Långban Fe–Mn deposit, Värmland, Sweden

  • E. S. Zhitova
  • G. Yu. Ivanyuk
  • S. V. Krivovichev
  • V. N. Yakovenchuk
  • Ya. A. Pakhomovsky
  • Yu. A. Mikhailova
Mineralogical Crystallography


Pyroaurite [Mg6Fe23+ (OH)16][(CO3)(H2O)] from the Kovdor Pluton on the Kola Peninsula, Russia, and the Långban deposit in Filipstad, Värmland, Sweden were studied with single crystal and powder X-ray diffraction, an electron microprobe, and Raman spectroscopy. Both samples are rhombohedral, space group Rm, a = 3.126(3), c = 23.52(2) Å (Kovdor), and a = 3.1007(9), c = 23.34(1) (Långban). The powder XRD revealed only the 3R polytype. The ratio of di- and trivalent cations M2+: M3+ was determined as ~3.1–3.2 (Kovdor) and ~3.0 (Långban). The Raman spectroscopy of the Kovdor sample verified hydroxyl groups and/or water molecules in the mineral (absorption bands in the region of 3600–3500 cm–1) and carbonate groups (absorption bands in the region of 1346–1058 cm–1). Based on the data obtained, the studied samples should be identified as pyroaurite-3R (hydrotalcite group).


pyroaurite Kovdor Långban 


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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • E. S. Zhitova
    • 1
    • 3
  • G. Yu. Ivanyuk
    • 2
  • S. V. Krivovichev
    • 1
    • 2
  • V. N. Yakovenchuk
    • 2
  • Ya. A. Pakhomovsky
    • 2
  • Yu. A. Mikhailova
    • 2
  1. 1.Institute of the Earth SciencesSt. Petersburg State UniversitySt. PetersburgRussia
  2. 2.Kola Scientific CenterRussian Academy of SciencesApatity, Murmansk oblastRussia
  3. 3.Institute of Volcanology and Seismology, Far East BranchRussian Academy of SciencesPetropavlovsk-KamchatskyRussia

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