Manganese oxide is available in 20 different types and is categorized under the various categories of manganese in its oxidation state. Some of the categories of manganese are available in the mineral as:
* Tetravalent (Mn+)
* Trivalent (MnJ+)
* Divalent (Mn2~) manganese oxides
The tetra and trivalent manganese oxides are available widely in the continental and marine environments, with a large percentage in the ocean floors.