Pentahydrite

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Pentahydrite[1][2]
Mineralogical name Pentahydrite, Allenite
Chemical name Magnesiumsulfate Pentahydrite
Trivial name
Chemical formula MgSO4•5H2O
Other forms Kieserite (MgSO4•H2O)
Sanderite (MgSO4•2H2O)
Starkeyite (MgSO4•4H2O)
Hexahydrite (MgSO4•6H2O)
Epsomite (MgSO4•7H2O)
Meridianiite (MgSO4•11H2O)
Magnesium 12-Hydrate
Crystal system triclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C
Density (g/cm³) 1.9 g/cm3
Molar volume
Molar weight 210.3 g/mol
Transparency
Cleavage
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments unstable in air
Crystal Optics
Refractive Indices nx = 1.482
ny = 1.492
nz = 1.493
Birefringence Δ = 0.011
Optical Orientation negative
Pleochroism
Dispersion 45.1°
Used Literature
[Dana:1951]Title: Dana's System of Mineralogy
Author: Dana J.D.
Link to Google Scholar



Weblinks[edit]

Literature[edit]

[Dana:1951]Dana E.S. (eds.) Dana J.D. (1951): Dana's System of Mineralogy, 7, Wiley & SonsLink to Google Scholar