go to ORKG: http://orkg.org/orkg/predicate/P41236

Mono/polyhydrated sulfate mixture (nm)

Monohydrated Mg sulfate (MgSO4·H2O) and polyhydrated sulfate are the most common and abundant hydrous sulfates observed on Mars. Layers which have sulfates with little water (known as monohydrated sulfates) whereas other layers have higher amounts of water (called polyhydrated sulfates).