1. Institute of Meteoritics University of New Mexico Albuquerque New Mexico 87131 USA
2. Department of Earth and Planetary Sciences University of New Mexico Albuquerque New Mexico 87131 USA
3. National High Magnetic Field Laboratory Department of Earth Ocean & Atmospheric Science Florida State University Tallahassee Florida 32310 USA
4. Institute of Geochemistry and Petrology ETH Zürich 8092 Zurich Switzerland
5. New Mexico Bureau of Geology New Mexico Institute of Mining and Technology Socorro New Mexico 87801 USA
6. Department of Earth and Planetary Sciences University of California, Davis Davis California 95616 USA