1 2 Detection of Iron Substitution in Natroalunite-Natrojarosite Solid 3 Solutions and Potential Implications for Mars 4 5 6

Revision 1, Nov. 3, 2013 1 2 Detection of Iron Substitution in Natroalunite-Natrojarosite Solid 3 Solutions and Potential Implications for Mars 4 5 6 Thomas M. McCollom, Bethany L. Ehlmann, Alian Wang, Brian M. Hynek, Bruce 7 Moskowitz, and Thelma S. Berquó 8 9 Laboratory for Atmospheric and Space Physics and Department of Geological Sciences, 10 University of Colorado, Boulder CO 80309, USA; California Institute of Technology, Pasadena, 11 CA, 91125; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 12 91109; Deptartment of Earth and Planetary Sciences and McDonnell Center for Space Sciences, 13 Washington University, St. Louis, MO, 63130; Department of Earth Sciences and Institute for 14 Rock Magnetism, University of Minnesota, Minneapolis, MN 55455; Department of Physics, 15 Concordia College, Moorhead, MN 56562 16 17 18

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