1. Institut für Mineralogie, Leibniz Universität Hannover, Callinstraße 3, Hannover, Germany
2. Department of Geological Sciences, Brigham Young University, Provo, UT, USA
3. U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA, USA
4. Department of Geology, Centenary College, Shreveport, LA, USA
5. Idaho Geological Survey, University of Idaho, Moscow, ID, USA
6. Utah State University, Department of Geology, 4505 Old Main Hill, Logan, UT, USA