Jarosite in the Noctis Labyrinthus Region of Mars. Image acquired on Nov. 24, 2015 by the High Resolution Imaging Science…

transcendentaly:

Jarosite in the Noctis Labyrinthus Region of Mars. Image acquired on Nov. 24, 2015 by the High Resolution Imaging Science Experiment (HiRISE) camera aboard NASA’s Mars Reconnaissance Orbiter. 

http://www.nasa.gov/image-feature/jarosite-in-the-noctis-labyrinthus-region-of-mars