WHITENESS: Grade A >95% Grade B >93% Grade C >91% CHEMICAL ANALYSIS PHYSICAL PROPERTIES CaCO3 â?¥98.5% Size 10-40 cm MgO â?¤0.16% PH 8.0-9.0 Fe2O3 â?¤0.01% Moisture â?¤0.2% Al2O3 â?¤0.04% Specific Gravity 2.7g/cm3 SiO2 â?¤0.01% Hardness 3 Moh Na2O â?¤0.16% Ignition Loss â?¤43.08%