Phase equilibria in the KFeS2–Fe–S system at 300–600 °C and bartonite stability

  • Valentin O. Osadchii
  • Mikhail V. Voronin
  • Alexander V. Baranov
Original Paper


The article deals with phase relations in the KFeS2–Fe–S system studied by the dry synthesis method in the range of 300–600 °C and at a pressure of 1 bar. At the temperature below 513 ± 3 °C, pyrite coexists with rasvumite and there are pyrite–rasvumite–KFeS2 and pyrite–rasvumite–pyrrhotite equilibria established. Above 513 ± 3 °C pyrite and rasvumite react to form KFeS2 and pyrrhotite, limiting the pyrite–rasvumite association to temperatures below this in nature. The experiments also outline the compositional stability range of the copper-free analog of murunskite (K x Fe2−yS2) and suggest that mineral called bartonite is not stable in the Cl-free system, at least at atmospheric pressure and the temperature in the experiments. Chlorbartonite could be easily produced after adding KCl in the experiment. Possible parageneses in the quaternary K–Fe–S–Cl system were described based on the data obtained in this research and found in the previous studies. The factors affecting the formation of potassium–iron sulfides in nature were discussed.


K–Fe–S system Rasvumite Potassium–iron sulfide Phase relations Cl-bartonite 



The authors thank T.N. Dokina for performing the X-ray studies. The authors are also grateful to the anonymous reviewers and Dr. Mark S. Ghiorso for detailed and insightful comments and suggestions. The reported study was funded by the RFBR according to the research project no. 16-35-00479.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Experimental Mineralogy RASMoscowRussia
  2. 2.Faculty of GeologyMoscow State UniversityMoscowRussia

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