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]
  • Konyaite Na2Mg(SO4)2•5H2O[4]
  • Löweite Na12Mg7(SO4)13•15H2O.[5][6]
  • Vanthoffite Na6Mg(SO4)4
  • Na2Mg2(SO4)3 langbeinite form stable from 569.2 to 624.7°C[7]
  • 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]

References
  1. Archibald, E. H.; Gale, W. A. (August 1924). "The System Magnesium Sulfate-Sodium Sulfate-Water and a Method for the Separation of the Salts". Journal of the American Chemical Society. 46 (8): 1760–1771. doi:10.1021/ja01673a002.
  2. Leduc, Evelyne M. S.; Peterson, Ronald C.; Wang, Ruiyao (24 October 2009). "Sodium magnesium sulfate decahydrate, Na2Mg(SO4)2·10H2O, a new sulfate salt". Acta Crystallographica Section C. 65 (11): i81–i84. doi:10.1107/S0108270109028881. PMID 19893219.
  3. Leftwich, K.; Bish, D. L.; Chen, C. H. (1 October 2013). "Crystal structure and hydration/dehydration behavior of Na2Mg(SO4)2•16H2O: A new hydrate phase observed under Mars-relevant conditions". American Mineralogist. 98 (10): 1772–1778. Bibcode:2013AmMin..98.1772L. doi:10.2138/am.2013.4509. S2CID 100629191.
  4. "Konyaite: Konyaite mineral information and data". www.mindat.org.
  5. "Löweite: Löweite mineral information and data". www.mindat.org.
  6. Mineralogy Database, MinDat.org
  7. Trussov, I.A.; Male, L.L.; Sanjuan, M.L.; Orera, A.; Slater, P.R. (April 2019). "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. 272: 157–165. doi:10.1016/j.jssc.2019.02.014.
  8. Kubel, Frank; Cabaret-Lampin, Marie (August 2013). "Syntheses and Structures of Na2Mg3(OH)2 (SO4)4·4H2O and K2Mg3(OH)3(SO4)4·2H2O". Zeitschrift für anorganische und allgemeine Chemie. 639 (10): 1782–1786. doi:10.1002/zaac.201300174.
  9. Schmidt, Gregory R.; Reynard, Jacqueline; Yang, Hexiong; Downs, Robert T. (6 September 2006). "Tychite, Na6Mg2(SO4)(CO3)4 : structure analysis and Raman spectroscopic data". Acta Crystallographica Section E. 62 (10): i207–i209. doi:10.1107/S160053680603491X.
  10. "Uklonskovite: Uklonskovite mineral information and data". www.mindat.org.

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