Kieserite

Kieserite
HJS MgSO4 092503-3.jpg
Mineralogical name	Kieserite
Chemical name	Magnesiumsulphate Monohydrate
Trivial name
Chemical formula	Mg[SO4] • H2O
Other forms	Sanderite (MgSO4•2H2O) Starkeyite (MgSO4•4H2O) Pentahydrite (MgSO4•5H2O) Hexahydrite (MgSO4•6H2O) Epsomite (MgSO4•7H2O) Meridianite (MgSO4•11 H2O) Magnesium 12-Hydrate
Crystal system	monoclinic
Crystal structure	monoclinic prismatic
Deliquescence humidity 20°C
Solubility (g/l) at 20°C	684 g/l (100°C)
Density (g/cm³)	2,57 g/cm3
Molar volume	53,85 cm3/mol
Molar weight	138,9 g/mol
Transparency	translucent
Cleavage	perfect
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments	can be produced from an aqueous solution over 67°C, soluble in water and glycerin, not soluble in waterless alcohol
Crystal Optics
Refractive Indices	nx = 1,523-1,520 ny = 1,535-1,533 nz = 1,586-1,584
Birefringence	Δ = 0,063-0,064
Optical Orientation	biaxial positive
Pleochroism
Dispersion	55°
Used 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.