1. Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
2. Deutsches Elektronen-Synchrotron (DESY), Petra III, Notkestraße 85, 22607 Hamburg, Germany
3. Center for Optical and Laser Materials Research, St. Petersburg State University, Ulyanovskaya str. 1, 198504 St. Petersburg, Russia
4. Kola Science Centre, Russian Academy of Sciences, Fersman str. 14, 184209 Apatity, Russia
5. Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
6. Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninskiy pr. 18, 119071 Moscow, Russia