Diammonium tris­[hexa­aqua­magnesium(II)] tetra­kis­[hydrogenphosphate(III)], (NH₄)₂[Mg(H₂O)₆]₃(HPO₃)₄

The framework of the title compound is made up of discrete Mg(H₂O)₆ octa­hedra, and HPO₃ and NH₄ tetra­hedra, which are organized in planes parallel to (010). Strong hydrogen bonding between the building units stabilizes the structure. The hydrogenphosphate(III) tetra­hedra, the ammonium tetra­hedron and one of the two Mg atoms lie on positions with m symmetry, whereas the second Mg atom is located on a position with 2/m symmetry.