Clay minerals
Jezero crater, once considered a site for the Mars Science Laboratory, is the landing site for the Perseverance Mars rover. Clay minerals have been detected in and around the crater. The Mars Reconnaissance Orbiter identified smectite clays. Clays form in the presence of water, so this area probably once held water and maybe life in ancient times. The surface in places are cracked into polygonal patterns. Such shapes often form when clay dries out.