Silica Sand SIO2 reaches to 99.8% with very low Iron Fe2O3 0.12%. Chemical Compositions SiO2 99.3-99.85 Fe2O3 0.012-0.014 Cr2O3 0.0003 Max TiO2 Traces Al2O3 0.10 - 0.20 CaO 0.02 - 0.05 MgO 0.002 - 0.005 L.O.I 0.1-0.2