Cobalt(II,III) oxide

Cobalt(II,III) oxide is an inorganic compound with the formulaCo₃O₄. Along with cobalt(II) oxide, it is one of two well characterized and stable cobalt oxides. It is a black antiferromagnetic solid. As a mixed valence compound, its formula is sometimes written as CoCo3+2O₄ and sometimes as CoO·Co₂O₃. It occurs naturally as the rare mineral guite which is named in honor of Prof. Xiangping Gu (1964-).