1. Friedrich-Schiller-University Jena; Institute of Geosciences, Department of General and Applied Mineralogy; Carl-Zeiss-Promenade 10 07745 Jena Germany
2. Institute of Mineralogy and Crystallography; University of Vienna, Geocentre; Althanstr. 14 1090 Vienna Austria
3. Karlsruhe Institute of Technology; Institute for Synchrotron Radiation; Hermann-von-Helmholtz Platz 1 D-76344 Eggenstein-Leopoldshafen Germany