Pentahydrite

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Pentahydrite[1][2]
Mineralogical name Pentahydrite, Allenite
Chemical name Magnesiumsuphate Pentahydrite
Trivial name
Chemical formula MgSO4•5H2O
Other forms Kieserite (MgSO4•H2O)
Sanderite (MgSO4•2H2O)
Starkeyite (MgSO4•4H2O)
Hexahydrite (MgSO4•6H2O)
Epsomite (MgSO4•7H2O)
Meridianite (MgSO4•11H2O)
Magnesium 12-Hydrate
Crystal system triclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C
Density (g/cm³) 1,9 g/cm3
Molar volume
Molar weight 210,3 g/mol
Transparency
Cleavage
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments not stable in air
Crystal Optics
Refractive Indices nx = 1,482
ny = 1,492
nz = 1,493
Birefringence Δ = 0,011
Optical Orientation negative
Pleochroism
Dispersion
Used Literature
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