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The title compound, Ag 2 Ni 3 (HPO 4 )(PO 4 ) 2 , has been synthesized by the hydro­thermal method. Its structure is formed by two types of chains running along the  b  axis. The first chain results from a linear and continuous succession of NiO 6  octa­hedra linked to PO 4  tetra­hedra by a common vertex. The second chain is built up from two adjacent edge-sharing octa­hedra (dimers) whose ends are linked to two PO 4  tetra­hedra by a common edge. Those two types of chains are linked together by the phosphate groups to form polyhedral sheets parallel to the (001) plane. The three-dimensional framework delimits two types of hexa­gonal tunnels parallel to the  a -axis direction, at ( x , 1/2, 0) and ( x , 0, 1/2), where the Ag atoms are located. Each silver cation is surrounded by eight O atoms. The same Ag +  coordination is found in other phosphates with the alluaudite structure, for example, AgMn 3 (PO 4 )(HPO 4 ) 2 . Moreover, O—H⋯O hydrogen bonds link three PO 4  tetra­hedra so as to build a three-dimensional network.

Disilver(I) trinickel(II) hydrogenphosphate bis(phosphate), Ag2Ni3(HPO4)(PO4)2

Disilver(I) trinickel(II) hydrogenphosphate bis(phosphate), Ag₂Ni₃(HPO₄)(PO₄)₂