MINERALOGY. 239 



I* Fine-grained, and 



c . Scaly, in Loos cobalt mines in the pro- 

 vince of Helfingeland ; at which place it 

 is of a lighter colour than the foreign 

 ones. Thefe two are often from their 

 colour confounded with the liver-colour- 

 ed marcafite. Seel:, cliii. 



SECT. CCLVIL 



2. With the acid of vitriol, Niccolum adh 

 vitrioli miner alt fatum. 



This is of a beautiful green colour, and 

 may be extracted out of the nickel ochre, 

 (Seel, eclv.) or efflorefcence of the Kup^ 

 fernickel. 



SECT. CCLVIII. 



Observations on Nickel. 



The cobalt, bifmuth, and nickel, are commonly 

 found together in the fame mines, by which it 

 happens, that, when the firft, as the moft ufeful 

 of them all, is to be made into glafs, the adhe- 

 rent nickel, according to its nature, unites with 

 the fulphur and arfenic, of which fome portion 

 remains after the calcination, and makes with 

 them a regule. When thefe minerals (the fulphur 

 and arfenic) are in greater quantity than is wanted 

 for the nickel, they likewife reduce fome part of 

 the calces of the cobalt and bifmuth ♦, and in 

 this cafe the nickel, as a medium, uniting- the 

 other two, otherwife not mifcible femi-metals, in* 

 corporates them into the fame regule. From 

 hence arifes a difference in the contents of diffe- 

 rent regales •, and from this difference people, who 



have 



