wherein x is less than or equal to 0.02, {HEAD ~ M} is said {TAIL ~ initial lattice metal} and n is the valance of M, said crystalline composition having a total cation exchange capacity of less than about 0.7 meq/gram, which comprises the steps of 
wherein x is less than or equal to 0.02 , { HEAD ~ M } is said { TAIL ~ initial lattice metal } and n is the valance of M , said crystalline composition having a total cation exchange capacity of less than about 0.7 meq / gram , which comprises the steps of
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH