The novel materials are synthesized hydrothermally at 100-250 C from reaction mixtures containing an organic amine or quaternary ammonium salt (R) which becomes entrapped or
clathrated within the crystalline products of composition: xR*A1203.( 1 .O f 0.2)P,0,.yH20. The quantities x and y represent the amounts needed to fill the microporous voids within
the neutral AIPO, framework. The species R appears to fulfill an essential templating
or structure-directing role in the synthesis of these novel microporous phases since
without R dense AlP04 structures or known hydrates, AIPO4.nH20, form.