“Manganese oxides” is a term that actually refers to a group of manganese oxides and hydroxides. The many forms include MnO, Mn3O4, Mn2O3, MnO2, MnO3, and Mn2O7. More specifically, the term may be used to refer to any number of manganese materials including Birnessite, Manganite, Manganosite, and Pyrolusite, among others.
Manganese oxides are derived from manganese, a plentiful, naturally-occurring metal that is most commonly used to alloy aluminum and manufacture low-cost steel. Manganese oxides are sold in powder form and look brownish-black in color.