[1] Univ Seville, Dept Cristalog Mineral & Quim Agr, Seville, Spain
[2] Univ Orleans, CNRS, Ctr Rech Matiere Div, Orleans, France
[3] Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou, Peoples R China
[4] Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA
[5] Ctr Invest Energet Medioambientales & Technol CIE, Dept Medioambiente, Madrid, Spain