Arcanite

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Arcanite[1][2] [3]
Mineralogical name Arcanite
Chemical name Potassium sulfate
Trivial name Sulfate of Potash
Chemical formula K2SO4
Other forms
Crystal system orthorhombic
Crystal structure
Deliquescence humidity 20°C 98.2% (10°C), 97.6% (20°C), 97% (30°C)
Solubility (g/l) at 20°C 111.5 g/l
Density (g/cm³) 2.660 g/cm3
Molar volume 65.5 cm3/mol
Molar weight 174.26 g/mol
Transparency
Cleavage destinct to good
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments
Crystal Optics
Refractive Indices nx = 1.494
ny = 1.495
nz = 1.497
Birefringence Δ = 0.003
Optical Orientation positive
Pleochroism
Dispersion
Used Literature
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Weblinks[edit]

  1. http://webmineral.com/data/Arcanite.shtml viewed on 20/07/2010
  2. http://www.mindat.org/min-314.html viewed on 20/07/2010
  3. <bib id="Robie.etal:1978">