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The title compound, (NH4)4(H6ZnMo6O24).6H2O, exhibits a structure with six MoO6 octahedral edge-sharing units surrounding a central ZnO6 octahedron, with all metal atoms in a common plane. The average Zn-O distance is 2.081 (5) Å, while the average Mo-O distances are 2.240 (16), 1.946 (12) and 1.711 (13) Å for four-, two- and single-coordinate O atoms, respectively.