Astrakanite

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Astrakanite[1]
CH GR Berguen EvKirche 0098 01 6 Bb 440um IMG 3337.JPG
Mineralogical name Astrakanite, Bloedite
Chemical name Sodium magnesium sulfate
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
{{{Literature}}}


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