The mineral aphthitalite, a non-hydrated sulfate of potassium and sodium, is one of the rarer of the natural soluble sulfates. It has been reported at Vesuvius,2 where it is rather common and was first discovered in 1795, at Racalmuto in Sicily,3 at Douglashall near Stassfurt,4 and more recently at Searle’s Lake, in California,5 and at Etna.6 Ponte thinks that it probably occurs also at Stromboli. The composition is undoubtedly variable, but has been commonly (Dana, Groth, etc.) regarded as (K, Na)2SO4, with K2O : Na2O = 3:1.

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