]Q8 ANALYSIS OF JADE. 



mained united with it, by dissolving It in muriatic acid, was 

 precipitated by ammonia. After calcination it weighed six 

 parts and halF. But as its black colour indicated, that it 

 Some more still retained some oxide of manganese, I digested it repeat- 

 oKicle of man- Q^\y ^j^^j^ vinegar, evaporatlnar it to dryness every time, and 

 ganese sepa- : i • i • rr<y , " • 



rated from it. redissolvmg the residuum m water. The solutions being 



added together, and precipitated by potash, yielded 1| part 

 of oxide of manganese: the pure oxide of iron therefore 

 weighed but 5 parts. 

 Carbonate of Q. The muriatic solution (3) separated from the aluraine 

 ted b' "^carbo^' ^"^ metallic oxides was supersaturated cold with carbonate 

 r.ateof ammo- of ammonia. This separated 22 parts of carbonate of lime, 

 "'*■ which furnished after calcination 12^ parts of pure lime. 



The ammoiilacal licjuor, being filtered, let fall nothing on 

 ebullition. 

 No magnesia The 12f parts of lime I dissolved in sulphuric acid, and 

 eouldbetUsco- (jjgggtgj j.j ^ater : they were found to have the same de- 

 it^ gree of solubiUty as sul{)hate of lime, and I could not dis- 

 cover, either by crystallization, taste, or any other sign, an 

 atom of sulphate of magnesia. 

 Products. Thus a hundred parts of nephritic jade yielded m^ on this 

 occasion 



Silex 53-75 



Lime 12'75 



Alumine 1'5 



Oxide of iron 5 



"^ Oxide of manganese 2 



Water • • . • ••••••• 2-25 



77-25 

 Lpss • 2275 



100. 



From thegrpat This loss being mucR too great to be ascribed to an er- 



io>sanacidsus- rour in the process, I repeated the analysis in th^ s^me 



* manner, endeavouring in addition to detect the presence of 



any of the acids, that sometimes enter into the composition 



of minerals. 



but none After this examination, which was so far fruitless, though 



fouiMl, jj^ other respects it confirmed the preceding, giving nearly 



the 



