On the different Khuls of Cadm'ia, Sec. 36J 



aVcribcd certainly to the metal of cobalt, as has been placed 

 beyond all doubt, and clearly proved by the cxperimeiits of 

 M. Meyer, to be found in Sellers' Collections. 



Some, on the other hand, have endeavoured to Lanifli co- 

 balt from the number of metals ; but no one will certainly 

 any longer doubt of its being a peculiar metal, fmce it is well 

 eftabliflied, that finiple fubltances are properly confidered to 

 be fpecifically different when they exhibit various properties 

 which other bodies do not poflefs, and that every fubftance 

 IS confidered as limple when it cannot be feparated into dif- 

 ferent principles, and be again formed from them. Now this 

 is confirmed in regard to cobalt; and it is found that it not 

 only poffeires properties diflerent from thofe of all other me- 

 tals, but is itfelf a metal of a totally peculiar kind. Evea 

 though there be an analogy between iron, nickel, arfenic, 

 and cobalt; and though, according to the fuppofed hypo- 

 thefis, the regulus of cobalt is only a variety of iron, and that 

 it is difficult, if not impoffible, to feparate it from cobalt; 

 yet the latter ftill remains a metal of a peculiar kind. 



The firft and principal refearches for difcovering cobalt 

 niincs were made in the Saxon mountains, and thefe pro- 

 cured to that country an opportunity of carrying on a con- 

 fiderable trade with this produ6lion. Good cobalt ore, fit 

 for colouring, is found at prefent, though not in fuch abun- 

 dance, in HeflTe, Wurtemberg, the Harx, Bohemia, Pruflia, 

 Silefia, and Sweden. 



As far as I knpw, pure native cobalt has never yet been 

 found ; what is commonly pretended to be fuch, is mine- 

 j-alifed by arfenic. It is found in an oxygenated {late, and 

 always combined with iron, and alfo mineralifed with cai'- 

 bonic acid ; in vitrious cobalt ore, by the fulphuric and 

 the arfenical acids; and to this belongs the fo called flowers 

 of cobalt, found in tender reddilh cryftals : it is alfo found 

 piineralifed by arfenic, with a little iron, in dull grey cobalt 

 pre ; by fulphur and arfenic, with iron, in while arfenical 



cobalt 



