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Magnesium sulfate is an inorganic salt (chemical compound) containing magnesium, sulfur and oxygen, with the formula MgSO4. It is often encountered as the heptahydrate sulfate mineral epsomite (MgSO4·7H2O), commonly called Epsom salt. Anhydrous magnesium sulfate is used as a drying agent. The anhydrous form is hygroscopic; hydrate is often preferred when preparing solutions. The Magnesium sulfate sold by Wintersun here is the Magnesium Sulfate Anhydrous. Synonyms: Magnesium sulfate (1:1); Sulfuric acid magnesium salt (1:1); Magnesium sulfate, anhydrous. CAS No: 7487-88-9 Molecular Formula: MgSO4 Molar Mass: 120.39 g/ mol.