SUMMARY High content of SiO2 and Al2O3 in maredan clay originating from Siak Regency, Riau Province can be used as raw material in zeolite synthesis. This clay consists of the minerals kaolinite, illite and quartz. Zeolite is a hydrated aluminosilicate mineral that contains alkaline and alkaline earth metals. Zeolites can be used as catalysts and adsorbents. Zeolite is more widely used because…