Chrome Ore Concentrate Chrome Ore Concentrate Specifications / Chemical compositions (on dry basis): Cr2O3: 44% to 40% minimum SiO2: 6% max Cr/Fe: 1.3:1 to 1.9:1 Al2O3: 16% max MgO: 12% max P: 0.01%max S: 0.01%max Physical composition Size: 0-2mm 98% min Moisture: 5% max