1. Lunar and Planetary Institute Universities Space Research Association 3600 Bay Area Blvd Houston Texas 77058 USA
2. Astromaterials Research and Exploration Science NASA‐Johnson Space Center Houston Texas 77058 USA
3. CNR—Istituto di Geoscienze e Georisorse I‐35131 Padova Italy
4. Physics Department University of Khartoum Khartoum 11115 Sudan
5. Department of Earth and Planetary Sciences Birkbeck, University of London Malet Street, Bloomsbury London WC1E 7HX UK
6. Department of Geological Sciences Brown University Providence Rhode Island 02912 USA
7. Department of Earth and Planetary Sciences University of California at Los Angeles 595 Charles Young Drive East Los Angeles California 90095 USA
8. Wisc‐SIMS Laboratory Department of Geoscience University of Wisconsin‐Madison 1215 West Dayton Street Madison Wisconsin 53706 USA
9. Department of Space Studies Southwest Research Institute 1050 Walnut St., Suite 300 Boulder Colorado 80302 USA
10. Department of Terrestrial Magnetism Carnegie Institution for Science 5241 Broad Branch Rd NW Washington District of Columbia 20015 USA
11. Institute for Geochemistry and Petrology ETH Zürich Clausiusstrasse 25 CH‐8092 Zürich Switzerland
12. Specola Vaticana V‐00120 Vatican City State Italy
13. Jacobs‐JETS University of Texas at El Paso at NASA‐JSC Houston Texas 77058 USA
14. SETI Institute 189 Bernardo Ave Mountain View California 94043 USA