Limestone, Argillaceous - ConstituentsCertified valuesNa2O ...........................0.0109 % P2O5............................ 0.0413 % Mn ...............................0.0209 %MgO ..............................0.301 % S................................. 0.1028 % Fe2O3 ..........................0.3191 %Al2O3 .............................0.526 % K2O............................. 0.1358 % ZnO.............................0.0022 %SiO2...............................4.080 % CaO.............................. 52.85 % SrO..............................0.0303%