Jarosite as an indicator of water-limited chemical weathering on Mars

@article{Madden2004JarositeAA,
  title={Jarosite as an indicator of water-limited chemical weathering on Mars},
  author={Megan E. Elwood Madden and Robert J. Bodnar and J. Donald Rimstidt},
  journal={Nature},
  year={2004},
  volume={431},
  pages={821-823}
}
The Mars Exploration Rover Opportunity identified the ferric sulphate mineral jarosite and possible relicts of gypsum at the Meridiani Planum landing site. On Earth, jarosite has been found to form in acid mine drainage environments, during the oxidation of sulphide minerals, and during alteration of volcanic rocks by acidic, sulphur-rich fluids near volcanic vents. Jarosite formation is thus thought to require a wet, oxidizing and acidic environment. But jarosite on Earth only persists over… 
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