Table 2: Chemical composition of OSA and clay.

Oxide content (%)SiO2Al2O3Fe2O3CaOMgOMnOK2OTiO2P2O5SO3ZnOSrOZrO2ClLOI

OSA8.471.682.9724.03.420.05731.220.0734.040.0301480.07423.8
Clay54.412.44.588.762.460.033.370.600.110.680.030.0270.03312.5