In the structure of the title phosphate, 4C(3)H(8)N(+). P(4)O(12)(4-)4H(2)O
, the (P4O12)(4-) cyclic anions are linked through OH ... O-P hydrogen bend
s to build layers parallel to the ab plane. These layers are themselves int
erconnected by means of N-H ... O hydrogen bonds originating from the (C3H5
NH3)(+) cations.