Manganese dioxide, also known as manganese(IV) oxide, is a chemical compound of manganese and oxygen. It contains manganese in the +4 oxidation state. Its chemical formula is MnO2. It is black and powdery. It is used as a depolarizer in alkaline batteries and Leclanche batteries. It is found naturally as the mineral pyrolusite.
Pyrolusite, hyperoxide of manganese, black oxide of manganese, manganic oxide
3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||86.9368 g/mol|
|Melting point||535 °C (995 °F; 808 K) (decomposes)|
|Std enthalpy of
|EU classification||Harmful (Xn)|
|Other anions||Manganese disulfide|
|Other cations||Technetium dioxide|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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