Manganese oxide is any of a variety of manganese oxides and hydroxides. These include Manganese(II) oxide, MnO Manganese(II,III) oxide, Mn3O4 Manganese(III) oxide, Mn2O3 Manganese dioxide, MnO2 Manganese(VI) oxide, MnO3 Manganese(VII) oxide, Mn2O7 Other manganese oxides include Mn5O8, Mn7O12 and Mn7O13. Minerals It may refer more specifically to the following manganese minerals: Birnessite Buserite Hausmannite Manganite Manganosite Psilomelane Pyrolusite Manganese may also form mixed oxides with other metals : Bixbyite, a manganese iron oxide mineral Jacobsite, a manganese iron oxide mineral Columbite Tantalite, a mineral group close to columbite Coltan, a mixture of columbite and tantalite Galaxite, a spinel mineral Todorokite, a rare complex hydrous manganese oxide mineral References Manganese compounds Manganese minerals Oxide minerals Transition metal oxides