Chvaleticeite

Chvaleticeite is a monoclinic hexahydrite manganese magnesium sulfate mineral with formula: (Mn2+, 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.
Chvaleticeite is named after the city Chvaletice, Bohemia, in the Czech Republic. Chvaleticeite and minerals like it have been studied for their hydrogen bonding and incongruent melting properties as they are predicted to form in the relative environments of Mars and other bodies in the solar system.