j 5 « A SYSTEM OF 



When it is of a light colour, it is 

 called in Swedifh Tennbett^or Wattnkies % 

 but Lefverjlag when it is of a deeper 

 colour. 



The iron prevails in this kind •, it 

 is therefore lels fit to have fulphur ex- 

 tracted from it, and alfo for the (melt- 

 ing of copper ores. It is found 

 i . Of a compact texture, from Nya 



Kopparberget in the province of 



Weftmanland. 



2. Steel -grained, from Stollberget in 

 Weftmanland. 



3. Coarfe-grained, from Wefter- 

 filfverbero;et in Weftmanland. 



SECT. CUV. 



2. Iron and Tin, Sulphur ferro & ft am* 

 faturatum. Black Lead, or Wadd, Mo~ 

 lybdtena. 



If by fuch a mixture as this the iron 

 and tin be not rendered too volatile, it 

 muft be fuppofed that the great lofs 

 the Black Lead fuftains in the calcining 

 heat is occafioned from the fulphur, and 

 that the fulphur confequently makes out 

 the greateft part of the black lead. It 

 is found 9 



a. Lamellar and fhining, of the fame 

 colour as the potters lead ore, Mo- 

 lybdana membranacea ntten$. 



From Bifpergs Klack in the pro- 

 vince of Dalarne, Baftnas-grufva ac 

 Riddarlhyttan in Weftmanland, Alten- 

 burg in Saxony. 



The 



