DOI

  • Nikita V. Chukanov
  • Dmitry A. Varlamov
  • Igor V. Pekov
  • Natalia V. Zubkova
  • Anatoly V. Kasatkin
  • Sergey N. Britvin

Solid solutions involving natural Mn3+O(OH) polymorphs, groutite, manganite, and feitknechtite are characterized and discussed based on original and literature data on the chemical composition, powder and single-crystal X-ray diffraction, and middle-range IR absorption spectra of these minerals. It is shown that manganite forms two kinds of solid-solution series, in which intermediate members have the general formulae (i) (Mn4+, Mn3+)O(OH,O), with pyrolusite as the Mn4+O2 end-member, and (ii) (Mn3+, M2+)O(OH, H2O), where M = Mn or Zn. In Zn-substituted man-ganite from Kapova Cave, South Urals, Russia, the Zn2+:Mn3+ ratio reaches 1:1 (the substitution of Mn3+ with Zn2+ is accompanied by the coupled substitution of OH with H2O). Groutite forms solid-solution series with ramsdellite Mn4+O2. In addition, the incorporation of OH anions in the 1 × 2 tunnels of ramsdellite is possible. Feitknechtite is considered to be isostructural with (or structurally related to) the compounds (M2+, Mn3+)(OH, O)2 (M = Mn, Zn) with a pyrochroite-related layered structure.

Язык оригиналаанглийский
Номер статьи969
Число страниц13
ЖурналMinerals
Том11
Номер выпуска9
DOI
СостояниеОпубликовано - 6 сен 2021

    Предметные области Scopus

  • Геотехническая инженерия и инженерная геология
  • Геология

ID: 86027643