ray diffraction pattern its properties and method for its preparation are described in detail in u s pat no 3 216 789 zeolite l has been characterized in 34 zeolite molecular sieves 34 by donald w breck john wiley and sons 1974 reprinted 1984 as having a framework comprising 18 tetrahedra unit cancrinite type cages linked by double six rings in columns and cross linked by single oxygen bridges to form planar 12 membered rings the hydrocarbon sorption pores for zeolite l are reportedly approximately 7 u00e5 in diameter the breck reference and u s pat no 3 216 789 are incorporated herein by reference particularly with respect to their disclosure of zeolite l the various zeolites are generally defined in terms of their x ray diffraction patterns several factors have and effect on the x ray diffraction pattern of a zeolite such factors include temperature pressure crystal size impurities and type of cations present for instance as the crystal size of the type l zeolite becomes smaller the x ray diffraction pattern becomes somewhat broader and less precise thus the term 34 zeolite l 34 includes any of the various zeolites made of cancrinite cages having an x ray diffraction pattern substantially the same as the x ray diffraction patterns.