Jarosite is a potassium and iron hydrous sulfate that was identified by the Opportunity rover, and it might be useful in retaining textural and chemical evidence of past history on Mars. It is a common mineral on the Red Planet found in many locations, such as Ius Chasma in Valles Marineris.

ID: ESP_062760_1710
date: Monday, 16 December 2019
altitude: 262 km (162.44 mi)

https://uahirise.org/hipod/ESP_062760_1710
NASA/JPL-Caltech/University of Arizona
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