The title compound, (NH4)2Cd3(SO4)3(OH)2(H2O)2, has been obtained serendipitously. It is isotypic with the heavier alkali analogues M 2Cd3(SO4)3(OH)2(H2O)2 (M = K, Rb, Cs). The structure contains two Cd2+ ions, one in a general position and one with site symmetry m. The former Cd2+ ion is coordinated by three O atoms of three SO4 groups, two hydroxide O atoms and one water O atom, the latter Cd2+ ion by four O atoms of four SO4 groups and two hydroxide O atoms, both in a distorted octahedral coordination geometry. This arrangement leads to the formation of a layered framework extending parallel to (100), with the ammonium cations situated in the voids. O—H⋯O hydrogen bonds involving the water molecules, hydroxide groups and sulfate O atoms, as well as N—H⋯O hydrogen bonds between ammonium cations and sulfate O atoms consolidate the crystal packing
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