In the paper there are presented the results of hydrothermal zeolite synthesis of basaltic tuff deriving from Gracze basalt deposit. The synthesis was conducted in condition of atmospheric pressure, in temperature of 95-100°C. The aim of the work was tuffs enriching in sorptive zeolite components effected by artificial hydrothermaI solution. The synthesis was conducted in two different ways: first - with using the solution of soda lye, and second - with using the mixture of soda lye and liquid glass. The synthesis proved that it is possible to raise the amount of zeolites in tuff by the influence of hydrothermal solutions, containing sodium and silica, in the atmospheric pressure. The enriching in zeolites, such as: analcite, phillipsite and chabazite is accompanied by simultaneous chemical decomposition of basalt components, which could reduce the tuff sorptive properties. There is also revealed the advantageous influence of tuff initial activation by sulphuric acid to zeolite forming process.