1. Institute of Crystallography Federal Scientific Center “Crystallography and Photonics,” Russian Academy of Sciences Moscow 119333 Russia
2. Section Crystallography Institute of Geology und Mineralogy University of Cologne Zülpicher Str. 49 b Köln 50674 Germany
3. Institute of Optics and Atomic Physics Technical University of Berlin Berlin 10623 Germany
4. Institute of Atmospheric Physics German Aerospace Center (DLR) Münchener Str. 20 Oberpfaffenhofen Wessling 82234 Germany
5. Faculty Geosciences University Bremen Klagenfurter Straße 2‐4 Bremen 28359 Germany