Aphthitalite

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Aphthitalite[1][2]
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 = 1.491
ne = 1.499
Birefringence Δ = 0.008
Optical Orientation positive
Pleochroism
Dispersion
Used Literature
[JCPDS:1991]Title: JCPDS Powder Diffraction File 2 (PDF-2)
Link to Google Scholar
[Dana:1951]Title: Dana's System of Mineralogy
Author: Dana J.D.
Link to Google Scholar


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References[edit]

Literature[edit]

[Dana:1951]Dana E.S. (eds.) Dana J.D. (1951): Dana's System of Mineralogy, 7, Wiley & SonsLink to Google Scholar
[JCPDS:1991] (1991): JCPDS Powder Diffraction File 2 (PDF-2).Link to Google Scholar