Sr(5)(V(IV)OF(5))(3)F(H(2)O)(3) refined from a non-merohedrally twinned crystal

The title compound, penta­strontium tris­[penta­fluorido­oxido­vanadate(IV)] fluoride trihydrate, was obtained under hydro­thermal conditions. Its crystal structure has been refined from intensity data of a non-merohedrally twinned crystal. Two domains in almost equal proportions are related by a −180° rotation along the reciprocal [101]* vector. The structure may be considered as a derivative of the fluorite structure type, adopted here by SrF(2). In the title compound, fluorite-like large rods are recognized, built up from a group of 16 Sr atoms of which 6 are substituted by V atoms, leading to [Sr(10)V(6)](∞) units. These rods extend infinitely along the b axis and are inter­connected by the three water mol­ecules. Each of the water mol­ecules is shared by two different Sr atoms belonging to two different rods. The rods are also inter­connected by an ‘independent’ F atom in a distorted triangular [FSr(3)] coordination and by hydrogen-bonding inter­actions via donor water mol­ecules. The acceptors are either F atoms or the O atoms of the vanadyl ion, VO(2+), that is part of the [VOF(5)] isolated octa­hedron.