The zeolite was crystallized from reaction mixture compositions that fell within the following ranges of composition :SiO2/Al2O3=4-11;Na2O/Al2O3 = 1-1.5;(Na2O+TMA2O)/Al2O3 = 9 – 30; H2O/Al2O3 = 100-350. Crystallization periods of 24 to 72 hours usually necessary. Chemical analisis of ZK-4 indicated a high preference for sodium.