(4) Ferrous minerals containiron, non-ferrous minerals donot contain iron. Iron ore andmanganese are two importantferrous minerals. Chromite isalso a ferrous mineral; itschemical name is Iron ChromiumOxide, with the chemicalformula FeCr2O4. The nonferrousmetallic minerals includethe ores of copper, leadand zinc, tin, graphite, tungsten,mercury, etc.