Aphthitalite

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Aphthitalite[1][2] [3]
Aphthitalit-19082010-klein.jpg
Mineralogical name Aphthitalite
Chemical name Potassium sodium sulphate
Trivial name Glaserite, Vesuvian Salt
Chemical formula K3Na(SO4)2
Na2SO4•3K2SO4
Other forms
Crystal system trigonal
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C
Density (g/cm³) 1.35 g/cm3
Molar volume 246.2 cm3/mol
Molar weight 332.41 g/mol
Transparency transparent to opaque
Cleavage imperfect to fair
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments
Crystal Optics
Refractive Indices no = 1.487-1.491
ne = 1.492-1.499
Birefringence Δ = 0.005-0.008
Optical Orientation positive
Pleochroism
Dispersion
Used Literature
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References[edit]

  1. http://webmineral.com/data/Aphthitalite.shtml viewed on 29/07/2010
  2. http://www.mindat.org/min-280.html viewed on 29/07/2010
  3. <bib id="JCPDS:1991">