394 On S DA LITE, 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 inflant 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 difTolved in water, and expofed in the 

 open air to fpontaneous evaporation. The whole gradually 

 fhot into regular cryftals of fulphate of foda. This fait 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 adted 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. 



The preceding analyfis gives us the conflituents of fodalite 

 as follows : 



Silica, - 38.52 



Alumina, - - 27.48 



Lime, - ; 2.70 



Oxide of iron, - - 1.00 



Soda, - - - 2 3'5° 



Muriatic acid, - - 3.00 



Volatile matter, - - 2.10 



Lofs, - 1.70 



100.00 



Mr 



