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    Discovery of alunite in Cross crater, Terra Sirenum, Mars: Evidence for acidic, sulfurous waters 

    Ehlmann, Bethany L.; Swayze, Gregg A.; Milliken, Ralph E.; Mustard, John F.; Clarks, Roger N.; Murchie, Scott L.; Breit, George N.; Wray, James J.; Gondet, Brigitte; Poulet, Francois; Carter, John; Calvin, Wendy M.; Benzel, William M.; Seelos, Kimberly D. (2016)
    Cross crater is a 65 km impact crater, located in the Noachian highlands of the Terra Sirenum region of Mars (30 degrees S, 158 degrees W), which hosts aluminum phyllosilicate deposits first detected by the Observatoire ...