Table 1.

Different Hydrated Forms of MgSO₄·nH₂O (0≤n≤11) as Described in the Literature

Phase	n	Referencea
α-MgSO4	0	Rentzeperis and Soldatos, 1958; Fortes et al.,2007
β-MgSO4	0	Coing-Boyat, 1962; Yamaguchi and Kato, 1972; Fortes et al.,2007
γ-MgSO4	0	Rowe et al.,1967; Daimon and Kato, 1984
Kieserite	1	Hawthorne et al.,1987
Reagent monohydrateb	1	Chipera and Vaniman, 2007; Grindrod et al.,2010; Steiger et al.,2011
5/4 hydrateb	1.25	van't Hoff and Dawson, 1899; Hodenberg and Kühn, 1967
Sanderite	2	Ma et al.,2009a
2.4 hydratec	2.4	Chipera and Vaniman, 2007
2.5 hydratec	2.5	Ma et al.,2009b
Trihydrate	3	Hodenberg and Kühn, 1967; Fortes et al.,2010
Starkeyite	4	Baur, 1962, 1964a
Cranswickite	4	Peterson, 2011
Pentahydrite	5	Baur and Rolin, 1972
Hexahydrite	6	Zalkin et al.,1964
Epsomite	7	Baur, 1964b; Ferraris et al.,1973; Fortes et al.,2006
Meridianiite	11	Peterson and Wang, 2006; Peterson et al.,2007; Fortes et al.,2008

^aIn case the structure is known, this reference is given.

^bThe reagent monohydrate described by Chipera and Vaniman (2007) is reported to be a mixture of the 5/4 hydrate and sanderite (Grindrod et al., 2010).

^cThe 2.5 hydrate described by Ma et al. (2009b) is the 2.4 hydrate reported by Chipera and Vaniman (2007) (cf. Ma et al., 2009b).