Acid Strontium Sulphate, SrH₂(SO₄)₂

Acid Strontium Sulphate, SrH₂(SO₄)₂, is obtained by crystallisation from a solution of the sulphate in hot concentrated sulphuric acid. At 70° C. 14 parts of strontium sulphate dissolve in 100 of acid. On lowering the temperature, tabular rhombic crystals are obtained, and on raising it, cubes and octahedra. By exposure of the crystals or the solution to the air, brilliant leaflets of the monohydrate are formed.