Indium selenate, In₂(SeO₄)₃

Indium selenate, In₂(SeO₄)₃.10H₂O, is prepared by dissolving indium hydroxide in aqueous selenic acid and crystallising the solution. The crystals are hygroscopic and easily soluble in water. When mixed with the requisite amount of aqueous caesium selenate, caesium indium selenate, In₂(SO₄)₃.Cs₂SO₄.24H₂O, crystallises out in efflorescent crystals, which are described as tetragonal bipyramids and not regular octahedra as would be anticipated.