1. Felix Bloch Institute for Solid-State Physics, Leipzig University, Linnestrasse 5, Leipzig 04103, Germany
2. Department of Crystallography, St. Petersburg State University, University emb. 7/9, St. Petersburg 199034, Russia
3. Kola Science Center, Russian Academy of Sciences, Apatity, Murmansk Region 184200, Russia
4. Department of Chemistry, Moscow State University, Leninskie Gory 1, Moscow 119991, Russia
5. Institute for Inorganic Chemistry, Leipzig University, Johannisallee 29, Leipzig 04103, Germany
6. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, Makarova Str. 2, St. Petersburg 199034, Russia