Sodium magnesium sulfate

Sodium magnesium sulfate is a double sulfate of sodium and magnesium. There are a number of different stoichiometries and degrees of hydration with different crystal structures, and many are minerals. Members include:

• Blödite or bloedite: sodium magnesium sulfate tetrahydrate Na₂Mg(SO₄)₂•4H₂O^[1]
• Disodium magnesium disulfate decahydrate Na₂Mg(SO₄)₂•10H₂O^[2]
• Disodium magnesium disulfate hexadecahydrate Na₂Mg(SO₄)₂•16H₂O^[3]
• Na₂SО₄·MgSO₄·2.5H₂O^[4]
• Konyaite Na₂Mg(SO₄)₂•5H₂O^[5]
• Löweite Na₁₂Mg₇(SO₄)₁₃•15H₂O.^[6][7]
• Vanthoffite Na₆Mg(SO₄)₄
• Na₂Mg₂(SO₄)₃ langbeinite form stable from 569.2 to 624.7°C^[8]
• Na₂Mg₂(SO₄)₃ quenched monoclinic form^[8]
• Na₂Mg₃(SO₄)₄ orthorhombic form^[8]
• Na₂Mg(SO₄)₂ triclinic form^[8]

Salts containing other anions in addition to sulfate

• Na₂Mg₃(OH)₂(SO₄)₄•4H₂O^[9]
• Tychite hexasodium dimagnesium sulfate tetracarbonate Na₆Mg₂SO₄(CO₃)₄^[10]
• Uklonskovite NaMgSO₄F•2H₂O^[11]