Schönite

Schönite
Mineralogical name	Schoenite, Picromerite
Chemical name	Potassium magnesium sulfate hexahydrate
Trivial name
Chemical formula	K2Mg(SO4)2•6H2O
Other forms
Crystal system	monoclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C	250 g/l
Density (g/cm³)	2.15 g/cm3
Molar volume	198.4 cm3/mol
Molar weight	402.73 g/mol
Transparency	transparent
Cleavage	perfect
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments
Crystal Optics
Refractive Indices	nx = 1.461 ny = 1.463 nz = 1.476
Birefringence	Δ = 0.015
Optical Orientation	positive
Pleochroism
Dispersion
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.