394 On SODALITE, a new 
der, which proved on examination to be filica. The muriatic 
acid folution was mixed with fulphuric acid, evaporated to dry- 
nefs ; the refidue, digefted in hot water, and filtered, to fepa- 
rate the fulphate of barytes. The liquid was now mixed with , 
an excefs of carbonate of ammonia, boiled for an inftant or 
two, and then filtered, to feparate the earth and iron precipita- 
ted by the ammonia. The liquid was evaporated to drynefs, 
and the dry mafs obtained expofed to a red heat in a filver cru- 
cible. The refidue was diffolved in water, and expofed in the 
open air to fpontaneous evaporation. The whole gradually 
fhot into regular cryftals of fulphate of foda. This falt being 
expofed to a ftrong red heat, weighed 50 grains, indicating, ac- 
cording to BERTHOLLET’s late analyfis, 23.5 grains of pure fo- 
da. It deferves to be mentioned, that during this procefs, the 
filver crucible was acted on, and a fmall portion of it was af- | 
terwards found among the fulphate of foda. This portion: was 
feparated before the fulphate of foda was weighed. 
Tue preceding analyfis gives us the conftituents of fodalite 
as follows : 
Silica, - - - ee Pee 
Alumina, = - 27.48 
Lime, - - - 2.70 
Oxide of iron, - - 1.00 
Soda, - - - 23.50 
Muriatic acid, — - - 3.00 
Volatile matter, - - Jette) 
Lofs, - - - 1.70 
100.00 
