Turkey clinoptilolite-rich tuffs from Gördes and Bigadiç regions of western of Anatolia and their exchanged forms (K+, Na+, Mg2+ and Ca2+) were characterized by TG/DTG-DTA, DSC and XRF methods and the surface areas were also determined for both tuffs. TG-DTG
and DTA curves of all clinoptilolite samples were measured in the temperature range 30–1000 °C. All clinoptilolite samples
had major, rapid mass losses between 30 and 200 °C, with slower and less significant mass losses at higher temperatures. The
mass loss of the Natural-G is 9.54% while that of the Natural-B sample is 10.50%. Water content increases in the order of
K < Na < Ca < Mg for Bigadiç clinoptilolite samples and in the following sequence K < Na < Mg < Ca for Gördes clinoptilolite
samples. One mass loss step for all clinoptilolite samples was observed using differential scanning calorimeter (DSC) in the
range of 30–550 °C.