Moisture: 2.9% - Loss on ignition: 13.4% - Sulfur trioxide (SO3): 0.8% - Carbon (C): 9.0% - Silicon dioxide (SiO2): 81.2% - Iron oxide (FeO3): 0.4% - Aluminum oxide (Al2O3): 0.1% - Magnesium oxide (MgO): 0.4% - Calcium oxide (CaO): 0.6% - Sodium oxide (Na2O): 0.2% - Potassium oxide (K2O): 3.5% - Appearance density after compaction: 0.24%