Sodium magnesium sulfate is a doublesulfate 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]
^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. Bibcode:1924JAChS..46.1760A. doi:10.1021/ja01673a002.
^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. Bibcode:2009AcCrC..65I..81L. doi:10.1107/S0108270109028881. PMID19893219.
^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. S2CID100629191.
^Rakhmatzhanov, U. D.; Mirzakulov, Kh. Ch. (29 September 2023). "Polythermal Solubility of the MgSO4–Na2SО4–H2O System". Russian Journal of Inorganic Chemistry. 68 (11): 1606–1610. doi:10.1134/S0036023623601642. S2CID263274944.
^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.
^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. Bibcode:2006AcCrE..62I.207S. doi:10.1107/S160053680603491X.