Anhydrous Sodium Sulphate is referred to as sulfuric acid sodium salt. Na2SO4 is the chemical formula for sodium sulfate. The mineral thenardite, which is also known as anhydrous sulfate, is described as a white, crystalline solid, whereas the decahydrate Na2SO4.10H2O is also known as mirabilis or Glauber salt. The natural mineral form of decahydrate, mirabilite, is created when Na2SO4. Mirabilite is the source of around two-thirds of the world production of sodium sulphate. Anhydrous Sodium Sulphate can also result from chemical reactions that produce byproducts like hydrochloric acid.