gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.2.268 Aquatic Hydrous Iron Oxide Colloids: Evidencing the Ambiguities Perret D. Institut de Chimie Minérale et Analytique, Université de Lausanne, CH-1015 Lausanne; Switzerland Gaillard J-F. Department of Civil Engineering, Northwestern University, Evanston 60208-3109, IL; USA Dominik J. Institut Forel, Université de Genève, CH-1290 Versoix; Switzerland Atteia O. Centre d'Hydrogéologie, Université de Neuchâtel, CH-2007 Neuchâtel; Switzerland 1998 62A 2 1151 1152 Copyright © 1998, The Mineralogical Society 1998