2820 90 90
Manganous oxide, Manganosite, manganese monoxide, oxomanganese
Manganese(II) oxide is an inorganic compound with chemical formula MnO. It forms green crystals. The compound is produced on a large scale as a component of fertilizers and food additives.
MnO occurs in nature as the rare mineral manganosite.
Commercially it is prepared by reduction of MnO2 with hydrogen, carbon monoxide or methane, e.g.:
MnO2 + H2 → MnO + H2O
MnO2 + CO → MnO + CO2