DOI

Technogenic steklite, KAl(SO4 )2, and unnamed mineral phase (K,Na)3 Na3 (Fe,Al)2 (SO4 )6 from burnt dumps of the Chelyabinsk Coal Basin have been investigated by single-crystal X-ray diffraction and electron microprobe analysis. Steklite is trigonal, space group P3, a = 4.7277(3), c = 7.9871(5) Å, V = 154.60(2) Å3 . The crystal structure was refined to R1 = 0.026 (wR2 = 0.068). It is based upon the [Al(SO4 )2 ]− layers formed by corner sharing of SO4 tetrahedra and AlO6 polyhedra. The anionic [Al(SO4 )2 ]− layers are parallel to the (001) plane and linked via interlayer K+ ions. The regular octahedral coordination of Al is observed that distinguishes technogenic steklite from that found in Tolbachik fumaroles. The (K,Na)3 Na3 (Fe,Al)2 (SO4 )6 phase is trigonal, space group R3, a = 13.932(2), c = 17.992(2) Å, V = 3024.4(7) Å3, R1 = 0.073 (wR2 = 0.108). The crystal structure is based upon the anionic chains [(Fe,Al)(SO4 )3 ]3− running parallel to the c axis and interconnected via K+ and Na+ ions. There are no known minerals or synthetic compounds isotypic to (K,Na)3 Na3 (Fe,Al)2 (SO4 )6, due to the presence of separate K and Na sites in its structure.

Original languageEnglish
Article number1062
Pages (from-to)1-12
Number of pages12
JournalCrystals
Volume10
Issue number11
DOIs
StatePublished - Nov 2020

    Research areas

  • Alkali–aluminum–iron sulfate, Anthropogenic (technogenic) mineralogy, Burnt dump, Chelyabinsk Coal Basin, Steklite

    Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

ID: 71329977