Starkeyite

Starkeyite
Mineralogical name	Starkeyite, Leonhardtite
Chemical name	Magnesiumsulphate 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	{{{Crystal_System}}}
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
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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A phase is a physically distinctive form of matter and is characterized by having relatively uniform chemical and physical properties.