1. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2. Department of Soil, Water, and Environmental Science, University of Arizona, Tucson, AZ 85721, USA
3. Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA
4. Gemological Institute, China University of Geosciences, Wuhan 430074, China