ijiS 
A SYSTEM OF 
y V 
When it is of a light colour, it is 
called in Swedifli "Tennbett^ or WattnkieSy 
but Lefverjlag when it is of a deeper 
colour. 
The iron prevails in this kind ; it 
is therefore lelsht to have fulphur ex- 
traded from it, and alfo for the fmelt- 
ing of copper ores. It is found 
1. Of a compad texture, from Nya 
Kopparberget in the province of 
Weftmanland. 
2. Steel-grained, from Stollberget in 
Weftmanland. 
3. Coarfe-grained, from Weftei% 
filfverberget in Weftmanland^ 
O 
> 
SECT. CLIV, 
2. Iron and Tin, Sulphur ferro fs? ft anno 
faturatum. Black Lead, or Wadd, Mo- 
lyhd^na. 
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, 
u. Lamellar and fhining, of the fame 
colour as the potters lead ore, Mo- 
lyhd^na memhranacea nitens. 
From Bifpergs Klack in the pro- 
vince of Dalarne, Baftnas-grufva at 
Riddarflryttan in Weftmanland, Alten- 
burg in Saxony, 
The 
