Abstract: The clinoptilolite - rich upper tuffs of Bigadiç area are in the form of coarse grained glassy as tuffs at thebottom and fine grained dust tuffs on the top. The framework structures of natural clinoptilolites taken from this both formation have been characterized by means of high - resolution solid - state nuclear magnetic resonans (NMR). The results of 29Si and 27A1 - MAS NMR studies of these samples have been compared with the data for various natural clinoptiloties. It is seen that they differ from the data of heulandite.