1823.] Mr. R. Phillips's Analysis ofUranite. 61 



mined by Mr. Lunn,* with two atoms, the mineral will appear 

 to consist of 



Silica 0-5 



Phosphoric acid 15*3 



Oxide of uranium 60*0 



Oxide of copper 9-0 



Water 13-8 



98-6 

 Loss 1*4 



100-0 



Neglecting the silica, we may consider the ore as essentially 

 composed of nearly 



Phosphate of uranium 73-2 



Phosphate of copper 12*3 



Water 14-5 



100-0 



On comparing the results of this analysis with those obtained 

 by Mr. Gregor, it will be observed, that the quantity of phos- 

 phate of uranium in 100 parts of the mineral differs only 2-2 

 from the weight of what he considered to be pure oxide of 

 uranium. It is indeed evident that in his mode of operating, he 

 precipitated, dried, and weighed the acid and oxide in combi- 

 nation. 



M. Berzelius seems to admit that the only material difference 

 between the uranite which he analyzed and the green variety, 

 arises from the accidental admixture of the latter with what he 

 supposed to be arseniate of copper ; when also it is observed 

 that what he estimates as oxide of uranium, agrees in 

 quantity with the phosphate in the green variety as nearly as 

 72*15 to 72-2, little doubt can be entertained that the mineral 

 from Autun, as well as that from Cornwall, is essentially com- 

 posed of phosphate of uranium. 



• Annals, vol. ill. New Series, p. 179. 



