Starkeyite

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Starkeyite[1][2]
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)
Meridianite (MgSO4•11H2O)
Magnesium 12-Hydrate
Crystal system monoclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C
Density (g/cm³)
Molar volume 95.87 cm3/mol
Molar weight 192.3 g/mol
Transparency translucent to opaque
Cleavage
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments not stable in air
Crystal Optics
Refractive Indices nx = 1.49
ny = 1.491
nz = 1.497
Birefringence Δ = 0.007
Optical Orientation positive
Pleochroism
Dispersion
Used Literature
{{{Literature}}}


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