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IRMGARD ABS-WURMBACH* AND CORNELIA BOBERSKI** *TU-Berlin, Institute for Mineralogy and Crystallography, Ernst-Reuter-Platz 1, D-10587 Berlin, Germany **Hoechst AG, PO Box 800320, D-65926 Frankfurt/Main, Germany ABSTRACT

contaiGlasses of stoichiometric cordierite composition Mg2(AIi-xFex)4SI5018, very low iron contents (x=0.015 and 0.005) have been investigated by ning 57 Fe M~ssbauer spectroscopy. At higher Fe concentrations spinel exsolution has been observed in X-ray powder patterns. To allow M(ssbauer spectroscopy at very low Fe-concentrations (

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