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Sulfur crystals on Mars NASA’s Curiosity rover made a surprise discovery when it found rocks made of pure sulfur, something never before seen on Mars. Curiosity viewed these yellow crystals of elemental sulfur using its Mast Camera, or Mastcam, on June 7, 2024, the 4,208th Martian day, or sol, of the mission. The Curiosity team is searching for clues in the surrounding area to help understand what would have formed this elemental sulfur. NASA/JPL-Caltech/MSSS