Manganese(II) sulfate minerals are very rare in nature and always occur as hydrates. The monohydrate is called szmikite; tetrahydrate = ilesite; hexahydrate (the most rare) = chvaleticeite; pentahydrate = jōkokuite; heptahydrate = mallardite.

Manganese deficiency. Taking manganese by mouth or giving manganese intravenously (by IV) helps to treat or prevent low manganese levels in the body. Also, taking manganese by mouth along with other vitamins and minerals can promote growth in children who have low levels of manganese in developing countries.