352 Elements of Mineralogy. 



Saxony* and at Allemont in Dauphin^ and 

 contains about 40 or 50 per cent, of filver, 

 and very Httle cobalt j the arfenic is in an 

 acid ftate, and united to the cobalt. 



28. To analyfe it, let it be diffolved in 

 nitrous acid ; the filver and cobalt will be taken 

 up, and moft of the iron will remain cal- 

 cined, together with the arfenic ; the filver 

 may be precipitated by the marine acid, and 

 the cobalt by an aerated fixed alkali, and its 

 weight determined, as will be {hewn ia 

 Chap. 13. 



SPECIES XIII. 



Mineralized by Sulphur, *wlth Regulus of An* 

 timony and Barytes. 



Butter~milk Ore. 



29. It appears in the form of thin pellicles, 

 on granular fpar. 



SPECIES XIV. 



Combuflile Silver Ore. 



30. This is black and brittle, and leaves 

 about 6 per cent of filver in its afhes, it is a 

 coal in which filver is found. The filver is 

 extracted as ufual by nitrous acid. 



SPECIES XV, 



