Elements &f Mineralogy. 

 feparated by boiling the whole as it is dephlo* 

 gifticated, and rendered thereby infoluble* 



Mineralized. 



5. We may obferve in general, that all cop- 

 per ores after roafting, communicate a blue 

 colour to volatil alkali, on digefting them in it. 

 Before roafting, it is poffible that arfenie may 

 prevent that effeft, or even fulphur, if in 

 fufficient quantity* 



SPECIES It. 



Mineralized by the Aerial Acid* 

 Calciform Ores. 



% 



6. Of thefe there are three varieties, the 

 red, the green, and the blue, all are foluble 

 in acids, and blacken in a moderate heat* 



I. VARIETY. 



Red, Minera cupri calciformis Rubra> M!ncra 

 hep at ic a> Leberertz. 



7. We fometimes meet with this ore in a 

 loofe form, then called copper ochre, but 

 generally it is moderately hard, yet brittle, 

 fometimes cryftalized and tranfparent, either 

 in a capillary formi or in cubes, prifms, or 



pyramids, 



