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Mineralogical name Bassanite
Chemical name Calciumsulfate hemihydrate
Trivial name
Chemical formula CaSO4•0.5H2O
Other forms
Crystal system monoclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C 3.0 g/l
Density (g/cm³) 2.64 g/cm3
Molar volume 55.04 cm3/mol
Molar weight 145.15 g/mol
Transparency transparent to translucent
Crystal habit
Phase transition
Chemical behavior
Comments hardly soluble in water
Crystal Optics
Refractive Indices no = 1.558
ne = 1.586
Birefringence Δ = 0.028
Optical Orientation positive
Used Literature
[Broul.etal:1981]Author: Broul M., Nyvlt J.; Soehnel O.
Editor: Elsevier
Publisher: Elsevier
Title: Solubility in organic two component systems
Year: 1981
Link to Google Scholar
[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

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[Broul.etal:1981]Elsevier (eds.) Broul M., Nyvlt J.; Soehnel O. (1981): Solubility in organic two component systems, %edition%, Elsevier, %address%, %pages%, %url%, %doi%Link to Google Scholar
[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