In the early stages of the reaction, the rate of the formation of the zeolite was slow so the crystallinity of the reaction product at 1/2 h is less than 50%. In the first hour, the reaction product exhibited high yield nearly equal to the crystallinity of the best reaction time 3 h. After the first hour of the reaction, the crystallinity of zeolite A showed slight decrease and increasing again at 3 h of crystallization reaction.