m 
MINER AI.O GY. 
i. Fine-grained, and 
f. Scaly, in Loos cobalt mines in the prb^ 
Vince of Hellingelafid ; 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. Sc6t, cliii, 
SECT. CCLVIL 
2. With the acid of vitriol, Niccolum acih 
vitrioU miner alif at um. 
This is of a beautiful green colour, and 
may be extraded out of the nickel ochre, 
(Sed. cclv.) 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 likewile reduce fome part of 
the calces of the cobalt and bifmuth ^ and in 
this cafe the nickel, as a medium, uniting the 
other two, otherv/ife not mlfcible femi-metals, in- 
corporates them into the fame regule. h’rom 
hence arifes a diiTerence in the contents of diffe- 
rent regules ^ and from this difference people, who 
bav^ 
