1. KR/Astromaterials Research Office; Astromaterials Research and Exploration Sciences Directorate; NASA/Johnson Space Center; 2101 NASA Parkway Houston Texas 77058 USA
2. Science Analysis and Research Development; Engineering and Science Contract Group; Houston Texas 77258 USA
3. Department of Geosciences; Franklin & Marshall College; Lancaster Pennsylvania 17604 USA
4. Max-Planck-Institut für Chemie; Hahn-Meitner-Weg 1 Mainz 55128 Germany