By evaporation of an aqueous mixture of metal(II) sulfate and ethanolammonium sulfate in the molar ratio 1:4 at room temperature, double sulfates with empirical formula (HOCH2CH2NH3)2M(SO4)2.4H2O (where M is Mn, Co, Ni, Cu, Zn, or Cd) were obtained. The double salts obtained were identified by X-ray powder diffraction, elemental analysis, TGA, and DTA. The compounds have similar structures (the copper compound is an exception); the Mn, Co, Ni, and Zn compounds are isostructural. The manner of their thermal decomposition is also given.