Sodium magnesium sulfate explained

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]
• Vanthoffite Na₆Mg(SO₄)₄
• Na₂Mg₂(SO₄)₃ langbeinite form stable from 569.2 to 624.7°C
• Na₂Mg₂(SO₄)₃ quenched monoclinic form^[7]
• Na₂Mg₃(SO₄)₄ orthorhombic form^[7]
• Na₂Mg(SO₄)₂ triclinic form^[7]

Salts containing other anions in addition to sulfate

• Na₂Mg₃(OH)₂(SO₄)₄•4H₂O^[8]
• Tychite hexasodium dimagnesium sulfate tetracarbonate Na₆Mg₂SO₄(CO₃)₄^[9]
• Uklonskovite NaMgSO₄F•2H₂O^[10]

External links

• HYDRATED SODIUM-MAGNESIUM SULFATE MINERALS ASSOCIATED WITH INLAND SALINE SYSTEMS Atomic structure, hydrogen bonding and phase stability. Evelyne Marie Sylvie Leduc. Queen’s University Kingston, Ontario, Canada. September 2010.

Notes and References

1. Archibald. E. H.. Gale. W. A.. The System Magnesium Sulfate-Sodium Sulfate-Water and a Method for the Separation of the Salts. Journal of the American Chemical Society. August 1924. 46. 8. 1760–1771. 10.1021/ja01673a002.
2. Leduc. Evelyne M. S.. Peterson. Ronald C.. Wang. Ruiyao. Sodium magnesium sulfate decahydrate, Na2Mg(SO4)2·10H2O, a new sulfate salt. Acta Crystallographica Section C. 24 October 2009. 65. 11. i81–i84. 10.1107/S0108270109028881. 19893219.
3. Leftwich. K.. Bish. D. L.. Chen. C. H.. Crystal structure and hydration/dehydration behavior of Na2Mg(SO4)2•16H2O: A new hydrate phase observed under Mars-relevant conditions. American Mineralogist. 1 October 2013. 98. 10. 1772–1778. 10.2138/am.2013.4509. 2013AmMin..98.1772L. 100629191.
4. Rakhmatzhanov . U. D. . Mirzakulov . Kh. Ch. . Polythermal Solubility of the MgSO4–Na2SО4–H2O System . Russian Journal of Inorganic Chemistry . 29 September 2023 . 10.1134/S0036023623601642. 263274944 .
5. Web site: Konyaite: Konyaite mineral information and data.. www.mindat.org.
6. Web site: Löweite: Löweite mineral information and data.. www.mindat.org.
7. Trussov . I.A. . Male . L.L. . Sanjuan . M.L. . Orera . A. . Slater . P.R. . Understanding the complex structural features and phase changes in Na2Mg2(SO4)3: A combined single crystal and variable temperature powder diffraction and Raman spectroscopy study . Journal of Solid State Chemistry . April 2019 . 272 . 157–165 . 10.1016/j.jssc.2019.02.014. 2019JSSCh.272..157T . 104364241 . 10261/192264 . free .
8. Kubel. Frank. Cabaret-Lampin. Marie. Syntheses and Structures of Na2Mg3(OH)2 (SO4)4·4H2O and K2Mg3(OH)3(SO4)4·2H2O. Zeitschrift für anorganische und allgemeine Chemie. August 2013. 639. 10. 1782–1786. 10.1002/zaac.201300174.
9. Schmidt. Gregory R.. Reynard. Jacqueline. Yang. Hexiong. Downs. Robert T.. Tychite, Na6Mg2(SO4)(CO3)4 : structure analysis and Raman spectroscopic data. Acta Crystallographica Section E. 6 September 2006. 62. 10. i207–i209. 10.1107/S160053680603491X.
10. Web site: Uklonskovite: Uklonskovite mineral information and data.. www.mindat.org.