Manganese oxide is any of a variety of manganese oxides and hydroxides. These include
- Manganese(II) oxide, MnO
- Manganese(II,III) oxide, Mn<sub>3</sub>O<sub>4</sub>
- Manganese(III) oxide, Mn<sub>2</sub>O<sub>3</sub>
- Manganese dioxide, MnO<sub>2</sub>
- Manganese(VI) oxide, MnO<sub>3</sub>
- Manganese(VII) oxide, Mn<sub>2</sub>O<sub>7</sub>
Other manganese oxides include Mn<sub>5</sub>O<sub>8</sub>, Mn<sub>7</sub>O<sub>12</sub> and Mn<sub>7</sub>O<sub>13</sub>.
Minerals
It may refer more specifically to the following manganese minerals:
- Birnessite,
- Buserite,
- Hausmannite,
- Manganite, MnO(OH)
- Manganosite, MnO
- Psilomelane, , or
- Pyrolusite,
Manganese may also form mixed oxides with other metals:
- Bixbyite, , a manganese(III) iron(III) oxide mineral
- Jacobsite, , a manganese(II) iron(III) oxide mineral
- Columbite, , a niobate of iron(II) and manganese(II)
- Tantalite, , a tantalum(V) mineral group close to that of columbite
- Coltan, a mixture of columbite and tantalite series
- Galaxite, , a spinel mineral
- Todorokite, , a rare complex hydrous manganese oxide mineral