From Saltwiki
Jump to navigation Jump to search

back to Sulfate

Mineralogical name Starkeyite, Leonhardtite
Chemical name Magnesiumsulfate Tetrahydrate
Trivial name
Chemical formula MgSO4•4H2O
Other forms Kieserite (MgSO4•H2O)
Sanderite (MgSO4•2H2O)
Pentahydrite (MgSO4•5H2O)
Hexahydrite (MgSO4•6H2O)
Epsomite (MgSO4•7H2O)
Meridianiite (MgSO4•11H2O)
Magnesium 12-Hydrate
Crystal system monoclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C
Density (g/cm³) 2.01 g/cm3
Molar volume 95.87 cm3/mol
Molar weight 192.43 g/mol
Transparency translucent to opaque
Crystal habit
Phase transition
Chemical behavior
Comments unstable in air
Crystal Optics
Refractive Indices nx = 1.49
ny = 1.491
nz = 1.497
Birefringence Δ = 0.007
Optical Orientation positive
Dispersion 22°
Used Literature
[Lide:1995]Title: CRC Handbook of Chemistry and Physics
Author: Lide D.R.
Link to Google Scholar
[Robson:1927]Title: The System MgSO4-H2O from 68 to 240°
Author: Robson H.L.
Link to Google Scholar



[Lide:1995]Lide D.R. (eds.) Lide D.R. (1995): CRC Handbook of Chemistry and Physics, CRC PressLink to Google Scholar
[Robson:1927]Robson H.L. (1927): The System MgSO4-H2O from 68 to 240°. In: J. Amer. Chem. Soc., 49 (11), 2772-2783Link to Google Scholar