Cation and anion sublattices in a series of typical cristal structures

The crystallographic analysis of Rb2NaAlF6 (Fd (3) over barm) and (Al,V)(4)(P4O12)(3) (I (4) over bar 3d) cubic structures and the trigonal structure of phenakite Be(2)SiO4 (R (3) over bar) is performed. In Rb2NaAlF6 a large and heavy Rb cation stabilizes cation and anion sublattices, promoting their maximum symmetry. In the structure of cyclic tetraphosphate, the core is formed by the cation sublattice with a noticeable deviation of P cations from its nodes. The anion arrangement ordered by pseudo-cubic and hexagonal sublattices with pseudosymmetry features dominates in the trigonal structure of phenakite.