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Aphthitalite

#PD49849

Aphthitalite

#PD49849
Availability
Sold
Size
5.5 x 1.5 x 1.5 cm - Sm Cabinet 
Formula
K3Na(SO4)2 (RRUFF)
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy

Vial dated 1870 with light blue crusts from volcanic fumaroles. In the book "Mount Vesuvius" J. Logan Lobley states "At Vesuvius it is (aphthitalite) sublimed in delicate white crystallisations on the lava about the fumaroles and in the crater. It was
found both on the lava of 1868 and on that of 1872. Aphthitalite occurs at other volcanoes also." Aphthitalite was named in 1832 by Beudant. It is actually stable in air as the name implies, a derivative of the Greek word "unalterable". Aphthitalite was originally described from Vesuvius found as delicate crystallizations and in masses an inch or more thick (Dana 6th ed.). The material inside the vial can be seen as excellent thin tabular crystals.



Antique Specimen

Aphthitalite

Formula
K3Na(SO4)2 
Crystal System
Trigonal 
Crystal Habit
Massive, Encrustations 
Cleavage
Good, None, None 
Luster
Vitreous - Resinous 
Color
blue, colorless, green, gray, gray blue 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness

Data courtesy of Webmineral.

Collection
Don Phillips Collection
Special Info
Antique Specimen

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