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Cobalt(II,III) oxide is a chemical compound. It contains some (1 atom) cobalt in the +2 oxidation state and some (2 atoms) in the +3 oxidation state. Its chemical formula is Co3O4. It contains cobalt and oxide ions.
It is made when cobalt(II) oxide is heated to 600 °C (1,112 °F). When it is heated to 900 °C (1,650 °F), it turns back into cobalt(II) oxide.
It has been used in research for making hydrogen.
It is irritating to the skin. It can cause harm if swallowed. It dissolves in the stomach acid.