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. Institute für Geowissenschaften, Frankfurt University, Altenhöferallee 1, DE-60438 Frankfurt am Main, Germany
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