Potassium bis(μ-sulfato-1κO:2κO′)bis­[cis-dioxido-cis-bis(sulfato-κO)tungstate(VI)]

The title compound, K₈[{W^VIO₂(SO₄)₂}₂(μ-SO₄)₂], precipitated from a melt of tungsten trioxide and potassium sulfate in potassium pyro­sulfate. The W^VI coordination sphere in the independent K₄[W^VIO₂(SO₄)₃] moiety is completed by inversion symmetry, resulting in a dimer with two bridging sulfate ligands and a unit cell with two dimeric units.