( 49 ) 



Vitreous copper ore 10 or 1 2 fulphur, and 90 



of copper. 

 j4zureore20 to 30 iron, from 40 to 60 of 



copper, the remainder fulphur. 

 Telloiv copper ore pyrites, fulphur, and 



from 4 to 30 parts of copper* 

 Grey copper ore arfenic, pyrites, from 35 



to 60 copper, and a little filver. 

 Bkndofe copper ore pyrites, pfeudo galena, 



from 1 8 to 30 copper. 

 Shijlofe copper ore fchiftus, fulphur, from 6 



to 10 of copper. 



100 Parts. Iron. 



Steel ore from 60 to 80 iron. 



Black eifen rahm 74 plumbago, 26 iron. 



Sparry iron ore 38 calcareous earth, 2 



ganefe, and 38 iron. 

 Flos ferri 65 calcareous earth, and 35 calx 



of iron. 



Magnetic fand of Virginia about 50 of iron. 

 Hematites from 40 to 80 of iron. 

 Grey iron ore fiderite, and. from 40 to 66 



of iron. 

 Highland argillaceous ore from 30 to 66 of 



iron. 



Ditto fwampy fiderite, and 36 of iron* 

 Siliceous ore 25 to 30 of iron. 



100 



