<P> Iron ores are rocks and minerals from which metallic iron can be economically extracted . The ores are usually rich in iron oxides and vary in colour from dark grey , bright yellow , or deep purple to rusty red . The iron itself is usually found in the form of magnetite ( Fe 3O 4 , 72.4 % Fe ) , hematite ( Fe 2O 3 , 69.9 % Fe ) , goethite ( FeO ( OH ) , 62.9 % Fe ) , limonite ( FeO ( OH ) n ( H O ) , 55 % Fe ) or siderite ( FeCO , 48.2 % Fe ) . </P>
<P> Iron ores are rocks and minerals from which metallic iron can be economically extracted . The ores are usually rich in iron oxides and vary in colour from dark grey , bright yellow , or deep purple to rusty red . The iron itself is usually found in the form of magnetite ( Fe 3O 4 , 72.4 % Fe ) , hematite ( Fe 2O 3 , 69.9 % Fe ) , goethite ( FeO ( OH ) , 62.9 % Fe ) , limonite ( FeO ( OH ) n ( H O ) , 55 % Fe ) or siderite ( FeCO , 48.2 % Fe ) . </P>
where does iron come from in the world
where does iron come from in the world
Iron ores
Iron ores