Hemipotassium hemirubidium digallium(III) manganese(II) tris(phos-phate) dihydrate.

The title manganese(II) substituted gallophosphate, K(0.5)Rb(0.5)[Ga(2)Mn(PO(4))(3)(H(2)O)(2)], features a three-dimensional network built of PO(4) tetra-hedra, GaO(5) trigonal bipyramids and MnO(6) octa-hedra. The Rb(I) and K(I) ions, which are disordered with respect to each other in a 1:1 ratio, occupy sites within the channels of the framework. The Rb(I)/K(I) and Mn(II) atoms occupy positions of 2 symmetry, as does one of the two P atoms. The Rb(I)/K(I) site is surrounded by six O atoms [2.996 (2)-3.178 (4) Å] in an irregularly-shaped coordination environment. O-H⋯O hydrogen bonds between the water molecules and phosphate O atoms consolidate the crystal packing.