ANALYSIS OF A NEWLY DISCOVERED MINERAL, 45 



reddifh brown powder, greatly refembling the red fulphurated 

 oxide of antimony. The fupernatant fluid was perfectly 

 tranfparent. 



C. The whole fluid was then warmed a little, and muriatic Addition of mu- 

 acid added to it gradually. The powder before feparated riatic acid com ~ 

 became thus foluble after this acid had been added in excefs. fi on# S 



It now acquired a dark green colour, and was perfectly 

 tranfparent. 



D. Having concentrated this fluid down to two ounces, no Evaporation to 

 filiceous earth being depofited, it was evaporated to perfect d ^ cfs » * ufio . n 

 drynefs. The relidue obtained was of a white colour. After lution and eva- 

 being ignited it weighed 110 grains. It was boiled again poration, as be. 



m / n • n -ui , j* j r fore » and the ad * 



with pure potalh in a filver crucible, evaporated to drynels, dit ; on f watei> 



and fufed. The fufed mafs was again diflblved in boiling feparated mucH 



water, muriatic acid was added in. excefs, and the whole*'"*' 



evaporated to drynels. On adding fome diftilled water to the 



relidue, an infoluble powder was obtained. This powder, 



after being warned in boiling diftilled water, was dried, and 



then ignited. Its weight amounted to 100 grains. It was 



pure filiceous earth. 



E. The fluid from which the foregoing product had been ob- Precipitate, from 

 tained, together with all the water expended in warning it, JjJjS ^'J?* 

 was collected together, evaporated, and mixed, whilft boiling afh j 



hot, with a folution of muriate of potafli. A reddifii brown 

 precipitate fell down, which, being collected upon a filtre, 

 was warned in diftilled water. 



F. The precipitate, after having acquired , a con fiderable was dried, boiled 

 degree of drynefs on the filtre, was boiled during four hours "?, P '*** then 



. . r • -i diluted, fepa- 



m a concentrated folution of pure potafli. The fluid was ra ted, and ig- 

 then attenuated with a confiderable quantity of boiling dif- mted * 

 tilled water, and transferred upon a filtre, of which the 

 weight had been previoufly afcertained. The refidue ob- 

 tained, after a repeated ebulition with boiling diftilled water, 

 was fiifTered to dry, and then ftrongly ignited. Its weight 

 was 32 grains. It was marked X. , 



G. The aqueous folution of potafli, together with all the The Tail folutioii 

 water ufed for warning the laft obtained products, was con- was fu P5 r - fatu - 



. ° .... rated with mu- 



centrated by evaporation. On adding muriatic acid to it,- a x-Iacic acid, and 

 precipitate enfued ; an excefs of acid was therefore added, in precipitated by 

 order to re-diffolve it. The folution was then decompofed by mon;a . it.gay* 

 means of carbonate of ammmonia. The precipitate now ob? alumht. 

 , 4 tained 



