Chvaleticeite
Chvaleticeite is a monoclinic hexahydrite manganese magnesium sulfate mineral with formula: (Mn, Mg)[SO4]·6(H2O). It occurs in the oxidized zone of manganese silicate deposits with pyrite and rhodochrosite that have undergone regional and contact metamorphism. It is defined as the manganese dominant member of the hexahydrite group.