1. School of Earth and Space Exploration, Arizona State University, P.O. Box 876004, Tempe, Arizona 85282-6004, USA
2. School of Earth and Sustainability, Northern Arizona University, Flagstaff, Arizona 86011, USA
3. Department of Mineralogy, University of Geneva, CH-1205 Geneva, Switzerland
4. Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA
5. Geology Department, Adrian College, 110 South Madison Street, Adrian, Michigan 49221, USA
6. 2539 Diamond Hill Road, St. Johnsbury, Vermont 05819, USA