The general principles of the structural organization for the existing type
s of orthophosphates with the { [L-2(PO4)(3)](p-) } (3 infinity) frameworks
, Where L is an octahedrally coordinated ion, are discussed. Representing t
hese frameworks by double LP6-octahedra, it is possible to find out the rel
ated structures and analyze their symmetry relation. (C) 2001 MAIK "Nauka/I
nterperiodica ".