Hexahydrite

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Hexahydrite[1][2]
Mineralogical name Hexahydrite, Magnesiumsulphate
Chemical name Magnesiumsulphate Hexahydrite
Trivial name
Chemical formula MgSO4•6H2O
Other forms Kieserite (MgSO4•H2O)
Sanderite (MgSO4•2H2O)
Starkeyite (MgSO4•4H2O)
Pentahydrite (MgSO4•5H2O)
Epsomite (MgSO4•7H2O)
Meridianite (MgSO4•11H2O)
Magnesium 12-Hydrate
Crystal system monoclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C 660 g/l
Density (g/cm³) 1,76 g/cm3
Molar volume 132,6 cm3/mol
Molar weight 228,46 g/mol
Transparency transparent to opaque
Cleavage perfect
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments
Crystal Optics
Refractive Indices α = 1,426
β = 1,453
γ = 1,456
Birefringence Δ = 0,030
Optical Orientation biaxial negative
Pleochroism
Dispersion 38°
Used Literature
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