Quantification of allophane from Ecuador - Kaufhold, Stephan (BGR Bundesanstalt für Geowissenschaften und Rohstoffe) ; Ufer, Kristian (Institute of Mineralogy. TU Bergakademie Freiberg) ; Kaufhold, Annette (Martin-Luther-University Halle-Wittenberg. Institute for Soil Sciences and Plant Nutrition) ; Stucki, Joseph W. (University of Illinois. Department of Natural Resources and Environmental Sciences) ; Anastácio, Alexandre S. (University of Illinois. Department of Natural Resources and Environmental Sciences) ; Jahn, Reinhold (Martin-Luther-University Halle-Wittenberg. Institute for Soil Sciences and Plant Nutrition) ; Dohrmann, Reiner (LBEG Landesamt für Bergbau, Energie und Geologie)