Astrakanite

Astrakanite
Mineralogical name	Astrakanite, Bloedite
Chemical name	Sodium magnesium sulphate
Trivial name
Chemical formula	Na2Mg(SO4)2•4H2O
Other forms
Crystal system	monoclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C
Density (g/cm³)	2,23 g/cm3
Molar volume	150,0 cm3/mol
Molar weight	334,48 g/mol
Transparency	transparent
Cleavage	none observed
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments
Crystal Optics
Refractive Indices	nx = 1,483-1,486 ny = 1,486-1,488 nz = 1,487-1,489
Birefringence	Δ = 0,004-0,003
Optical Orientation	biaxial negative
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.