Its is quite challenging to determine which rice husk ash (RHA) to be used as a raw material for geopolymer concrete as both the physical and chemical properties varies with each other by different burning conditions. Nevertheless the more is the reactive silica present in the RHA, more will be its effect in polymerization process. so my question is how to determine the amount of reactive(Amorphous) silica and non reactive crystalline silica present in RHA?