All authors
All authors
TEXT Sebastian Schmidt1, Prof. Dr. Dr. Herbert Pöllmann2, Prof. Dr. Wolfgang Krcmar1
        1University of Applied Sciences Nuremberg Georg Simon Ohm, Materials TechnNuremberg/Germany
        2Institute of Geosciences and Geography, Mineralogy/Geochemistry Section, Martin-Luther-Universität Halle-Wittenberg,          Halle (Saale)/Germany