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Hydrated magnesium sulfate salts have been proposed as major components of the disrupted, reddish terrains on the surface of Europa. This is based on near-infrared reflectance spectra which contain distorted and asymmetric water absorption features typical of moderately hydrated materials such as hexahydrite (MgSO 4 ⋅6H 2 O) and epsomite (MgSO 4 ⋅7H 2 O). Hydrated magnesium...