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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
Phase transition
Chemical behavior
Crystal Optics
Refractive Indices nx = 1.483
ny = 1.486
nz = 1.487
Birefringence Δ = 0.004
Optical Orientation biaxial negative
Dispersion 0.71°
Used Literature
[Dana:1951]Author: Dana J.D.
Edition: 7
Editor: Dana E.S.
Publisher: Wiley & Sons
Title: Dana's System of Mineralogy
Volume: 2
Year: 1951
Link to Google Scholar
[JCPDS:1991]Note: complied by the Joint Committee on Powder Diffraction Standards (JCPDS, Swarthmore, Pennsylvania, USA).
Title: JCPDS Powder Diffraction File 2 (PDF-2)
Year: 1991
Link to Google Scholar

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[Dana:1951]Dana E.S. (eds.) Dana J.D. (1951): Dana's System of Mineralogy, 7, Wiley & Sons, %address%, %pages%, %url%, %doi%Link to Google Scholar
[JCPDS:1991]%author% (1991): JCPDS Powder Diffraction File 2 (PDF-2), %howpublished%, %pages% %url%, %doi%Link to Google Scholar