[1] U.S. Geological Survey, Denver Federal Center, Denver, CO 80225, United States
[2] Global Gems and Minerals, Denver, CO 80235, United States
[3] U.S. Geological Survey, National Center, Reston, VA 20192, United States
[4] U.S. Geological Survey, Department of Geological Sciences, University of California, Riverside, CA 92521, United States
[5] College of Earth, Ocean and Atmospheric Sciences, Oregon State University, 104 CEOAS Administration Building, Corvallis, OR 97331-5503, United States