wherein x is less than or equal to 0.02, {HEAD ~ M} is said initial lattice metal and n is the valance of M, said crystalline composition having {TAIL ~ 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 initial lattice metal and n is the valance of M , said crystalline composition having { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH