Aphthitalite

Aphthitalite
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)	2.7 g/cm3
Molar volume	246.2 cm3/mol
Molar weight	332 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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A phase is a physically distinctive form of matter and is characterized by having relatively uniform chemical and physical properties.