Chemical and mineralogical characteristics of French green clays used for healing - Williams, Lynda B. (Arizona State University. School of Earth and Space Exploration) ; Haydel, Shelley E. (Arizona State University. The Biodesign Institute Center for Infectious Diseases and Vaccinology) ; Giese, Rossman F. (The State University of New York. Department of Geology) ; Eberl, Dennis D. (United States Geological Survey)