Chrome Run of Mine (ROM) Chrome Run of Mine (ROM) Specifications: Cr2O3: 32% to 44 – Depending on buyers requirement SiO2: 18% max Cr/Fe: 1.20:1 to 1.9:1 Al2O3: 18% max MgO: 16% max P: 0.001%max S: 0.001% max Moisture: Normally 0.5 to 3%