[1] Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA
[2] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
[3] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
[4] Univ Autonoma Madrid, Dept Fis Aplicada, E-28049 Madrid, Spain