234 Elements of Mineralogy. 



be precipitated, and the copper and iron may 

 be precipitated by the phlogifticated alkali, 

 and feparated as hereafter will be feen. 



SPECIES II. 



Mixed t with yellow or Martial Pyrites. 



8. It is found thus mixed in the mine of 

 Adelfors in Sweden. According to Cronjled^ 

 166, ico pounds of this ore contains but 

 one ounce of Gold, and it is faid to be hardly 

 worth extracting. The pyrites is of a bright 

 yellow colour, clofe and com pad:. The gold 

 in this ore is faid to be mineralized by ful- 

 phur, by the medium of iron, becaufe it can- 

 not immediately be extracted by aqua regia 

 or amalgamation, but Mr. Bergman^ though 

 he inclines to the opinion of the mineraliza- 

 tion of gold, yet is candid enough to own, 

 that the gold, when extracted from this ore, 

 being of a granular or angular form, it is 

 very doubtful whether it was not rather 

 mixed than truly combined with the ful- 

 phur and iron, and its proportion being ex- 

 ceeding fmall, it is not wonderful that it 

 fliould efcape aqua regia, more efpecially as 

 the nitrous acid becomes fo phlogifticated 

 by a&ing on the pyrites, as not to be able to 

 dephlogifticate the marine, and mercury, 

 from the nature of things, can have no ac- 

 cefs to it. 



9. This 



