Cobalt Oxide Cobalt OxideSynonym(s): Tricobalt tetraoxide; Cobaltic-cobaltous; Cobaltosic Oxide99% trace metals basisLinear Formula: Co3O4 CAS Number: 1308-06-1 EC Number: 215-154-6 MDL Number: MFCD00016031PubChem Substance ID: 9942118 NACRES: NA23