MARTIAN WATER CHEMISTRY. “There is growing evidence of pockets of near-surface water on Mars. The presence of indigenous nitrogen in sedimentary and aeolian deposits using the SAM instrument on-board the Curiosity rover was reported recently. Observations of hydrated salts, magnesium perchlorate, magnesium chlorate and sodium perchlorate on the Martian surface, were also recently announced.”
https://royalsocietypublishing.org/doi/10.1098/rsif.2016.0459