Iron(II,III) oxide Names IUPAC name Other names Identifiers ChEBI ChEMBL ChemSpider ECHA InfoCard 100.013.889 UNII Properties Fe3O4 FeO.Fe2O3 Molar mass 231.533 g/mol Appearance solid black powder Density 5 g/cm3 Melting point 1,597 °C (2,907 °F; 1,870 K) Boiling point 2,623[2]...