Abstract <p>The possibility of obtaining bulk zeolites by alkaline activation and subsequent hydrothermal treatment of natural kaolin grade KR-1 is studied. The alkaline activator is obtained by mixing solutions of water glass and sodium hydroxide. The mass fraction of water glass solution in the alkaline activator is varied from 0 wt % to 90 wt % in 10% increments. Depending on the amount of added liquid glass, amorphous geopolymer materials, as well as bulk zeolites with A and Y structures, are obtained, which is confirmed by the X-ray diffraction (XRD) data. Additional hydrothermal treatment of samples at 140°C in an alkaline medium lead to the crystallization of zeolites with sodalite, faujasite, and zeolite P structures.</p>