Bifmuth* 333 



SPECIES L 

 Native. 



3. This is the commoneft of all native me- 

 tallic fubftances* and is generally found either 

 in cubes or odagons, or of a dentritical form* 

 or in that of thin laminae inverting the ores 

 of other metals, particularly thofe of cobalt, 

 from which it is eaiily diftinguifhed and fepa- 

 rated by its great fufibility ; it is faid to be 

 fometimes alloyed with filver ; if fo, they are 

 eafily feparated by folution in nitrous acid, 

 and the addition of water, which precipitates 

 only the bifmuth, and leaves every other 

 metal in the folution. 



SPECIES IL 



Mineralized by the aerial Acid. 

 Native Calx of Bifmuth. 



4. When pure it is of a yellowilh white 

 colour, and either in a powdery form, or in- 

 durated like mortar ; but it is frequently of 

 a greenifh yellow colour, being mixed with 

 ores of other metals ; the red and yellow part 

 is moft commonly cobalt ore, though it 

 has often been miftakenfor bifmuth ; it is fre- 

 quently found in glittering particles interfperfed 

 through ftones of various kinds j filver, iron, 

 and other rnetals are alib found in it; frorn 



