Anhydrite

From Saltwiki

Author: Amelie Stahlbuhk
back to Sulfate

Anhydrite
Mineralogical name Anhydrite
Chemical name Calcium sulfate
Trivial name
Chemical formula CaSO4
Other forms CaSO4•0.5H2O (Bassanite)
CaSO4•2H2O (Gypsum)
Crystal system orthorhombic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C
Density (g/cm³) 2.96 g/cm3
Molar volume 45.94 cm3/mol
Molar weight 136.14 g/mol
Transparency
Cleavage
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments
Crystal Optics
Refractive Indices nx=1.5698
ny=1.5754
nz=1.6136
Birefringence Δ=0.0438
Optical Orientation positive
Pleochroism
Dispersion 43.7°
Used Literature
[Robie.etal:1978]Title: Thermodynamic properties of minerals and related substances at 298.15 K and 1 bar pressure and higher temperatures
Author: Robie R.A., Hemingway B.S.; Fisher J.A.
Link to Google Scholar
[Dana:1951]Title: Dana's System of Mineralogy
Author: Dana J.D.
Link to Google Scholar


References

<references/>

Literature

[Dana:1951]Dana E.S. (eds.) Dana J.D. (1951): Dana's System of Mineralogy, 7, Wiley & SonsLink to Google Scholar
[Robie.etal:1978]Robie R.A., Hemingway B.S.; Fisher J.A. (1978): Thermodynamic properties of minerals and related substances at 298.15 K and 1 bar pressure and higher temperatures. U.S. Geol. Surv. Bull, 1452 ()Link to Google Scholar