Mars Jarosite
In this image from the Mars Reconnaissance Orbiter’s HiRISE camera, the whitish areas are likely jarosite, a potassium and iron hydrous sulfate, mineral deposits typically found near volcanic vents.
![PIA20371.jpg](https://th-thumbnailer.cdn-si-edu.com/K-rIRx2GJYadQb6LK427LBqCRJ0=/1000x750/filters:no_upscale()/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/5a/e7/5ae7d452-35d9-4200-96f3-5cc66f518753/pia20371.jpg)
In this image from the Mars Reconnaissance Orbiter’s HiRISE camera, the whitish areas are likely jarosite, a potassium and iron hydrous sulfate, mineral deposits typically found near volcanic vents.