1. Institute for Earth and Environmental Sciences; University of Potsdam; 14476 Potsdam Germany
2. Institute of Optical Sensor Systems; German Aerospace Center; 12489 Berlin Germany
3. Institute of Planetology; University of Münster; 48149 Münster Germany
4. Museum für Naturkunde; 10115 Berlin Germany
5. Vernadsky Institute of Geochemistry and Analytical Chemistry; Russian Academy of Sciences; Moscow 119334 Russia
6. Chelyabinsk State University; Chelyabinsk 454001 Russia