18 The feveral SPECIES 



one, two, or the like fmall number of pounds 

 of copper, and called at Friberg copper-ore. Thus 

 were coppcr-pyrit<e diftinguifhed by a peculiar 

 name, whilft the iron-pyrit<e lay neglected, under 

 the fimple denomination of pyrites, or Jlone -pyrites, 

 or fulphur '-pyrites ; without any diftindt appellation 

 that mould denote the efTence of it. At Friberg 

 all fuch are iron pyrita as hold little or no copper. 



That kind called gold pyrites, when accurately 

 examined, as I have done all of them, proves 

 either a highly coppery fort, or the common 

 pyrites, fhewing externally of a beautiful gold- 

 colour ; thefe are particularly procured from 

 Hungary, and have groundlefly raifed extraor- 

 dinary expectations . I ho' when any gold or 

 filver is procured from pyrites, it may happen ei- 

 ther from the fpangles or threads of thefe me- 

 tals, or from a genuine filver-ore being unobfer- 

 vedly intermixed with the fample under proof. 

 Again, Men have been apt to be impofed upon 

 by the gold colour caft of the fample, whence 

 the ancients called it pyrites aurei coloris. After 

 all, the gold generally procurable by fuch 

 proofs is very inconfiderable ♦, nay, what is to be 

 met with in almoft all mineral glebes, and in moft, 

 if not all filver, for procuring which no pyrites was 

 ever particularly employed. 



Much the fame we may fay of what is called 

 filver-pyrites •, the fame cautions are neceflary to 

 prevent being deceived by the colour ; in regard 

 the mifspickel or arfenic- pyrites, that is, the white 

 pyrites, by the ancients called pyrites argentei co- 

 loris, comes properly under that diftinction, tho' 

 ufually holding the leaft filver, in comparifon of 

 the ycllowiih and yellow : and tho' almoft all 

 pyrites hold fome filver, yet it may be queried, 

 whether it does fo as a pyrites, without the in- 

 termixture of any other foreign vein. The mine- 



fecre- 



