MINERALOGY. ^7 



4. It is pretty fixt in the fire ; but together 

 with the fulphur and arfenic, with which 

 its ore abounds, it is fo far volatile, as to 

 rife in form of hairs and branches, if in 

 the calcination it is left without being 

 itirred. 



5. It calcines to a green calx. 



6. This calx is not very fufible, but however 

 tinges glafs of a tranfparent reddifh brown, 

 or jacinth colour. 



7. It dhTolves in aqua fortis, aqua regia, and 

 the fpirit of fea-falt, but more difficultly in 

 the vitriolic acid, tinging all thefe folutions 

 of a deep green colour. Its vitriol is of 

 the fame colour-, but the colcothar of this 

 vitriol, as well as the precipitates from the 

 folutions, become by calcination of a light 

 green colour. 



8. Thefe precipitates are diflblved by the 

 fpirit of ial ammoniac, and the folution has 

 a blue colour •, but being evaporated, and 

 the fediment reduced, there is no copper, 

 but a nickel regulus is produced. 



9. It has a flrong attraction to fulphur; fb 

 that when its calx is mixed with it, and 

 purs on a fcorifying teft under the muffel, 

 it forms with the fulphur a regule: This re- 

 gule refembles the yellow fteel-grained 

 copper-ores, and is hard and mining on 

 its convex furface. . \ 



10. It unites with all the metals, except 

 quickfiiver and filver. When the nickel 

 regulus is melted with the latter, it only 

 adheres clofe to it, both the metals lying 

 near one another on the fame plane •, but 

 they are eafily feparated with a hammer. 

 Cobalt has the ftrongeft attraction to nickel, 



after 



