1. Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA
2. 2148 McClintock Rd., Charlotte, North Carolina 28205, USA
3. Department of Geology, University of Vermont, Burlington, Vermont 05405, USA
4. Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA
5. Department of Earth and Environmental Sciences, University of Michigan, 1100 North University Avenue, Ann Arbor, Michigan 48109, USA