OBSERVATIONS. 31 
Grey cobalt ore/either without or with 
Bifmuth, is found at Dol-coth. The 
chemical analyfis of the firft kind, which 
refembles very much in colour, fraCture 
and other external appearances, the co¬ 
balt from Rappold at Schneeberg, which 
is ufed in manufactures will be given 
No. 4. 
Cryftallized pfeudo galena, or black¬ 
jack, mixed with pyrites, is found at St. 
Agnes. Pyrites or Mundick are to be met 
with very frequently in different forms : 
large cubes of pyrites imbedded in gra¬ 
nite are found at Wendron. 
Penzilly in Breage parifh affords hae¬ 
matites of a liver-brown colour mixed 
with manganefe. This foffil, which was 
fent from Cornwall by the name of li¬ 
ver-coloured Tungften, is found in a vein 
of a yellow friable iron-ochre, through 
which this fuppofed Tungften runs in. 
veins of different thicknefs and pofition. 
It is of a liver colour, even fraCture, and 
fomewhat fibrous texure, Th« experi¬ 
ments 
