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TEXT Sebastian Schmidt1, Tim Grotz1, Prof. Dr. Dr. Herbert Pöllmann2 and Prof. Dr. Wolfgang Krcmar1 1University of Applied Sciences Nuremberg Georg Simon Ohm, Materials Technology Department, Nuremberg/Germany
2Institute of Geosciences and Geography, Mineralogy/Geochemistry Section, Martin-Luther-Universität Halle-Wittenberg, Halle (Saale)/Germany
