1. Department of Ecosystem Science and Management, University of Wyoming, Laramie, Wyoming 82071, United States
2. Department of Mineral Sciences, Smithsonian Institution, Washington, District of Columbia 20013, United States
3. X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
4. Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States