( 
32 MlNERALOGICAL 
ments related under No. 5, will be a fuf- 
ficient proof, that this mineral is not 
Tungften, but manganefe mixed with 
much iron. 
Wolfram of a foliated texture united 
to quartz and white clay, is brought from 
Poldice. See experiments made upon 
it under No. 6. 
The Afphaltum, or indurated Bitumen, 
from Carrarach, is remarkable for being 
found 90 yards deep in granite. 
Of the different kind of Hones and 
earths of Cornwall, befidesthe above men¬ 
tioned killas and growan, the following 
are worthy of notice. 
Chalcedony from Trevafcus. It is 
found in fine, ftaladtitical, varioufly con¬ 
figured pieces formed of thin layers, and 
is now feldom to be met with. 
Steatites or foap rock is found running 
through ferpentine in fmall fhallow veins 
at Cape Lizard. The finefl: fpecies of it 
is white, ftreaked with veins of a blueifh 
and reddifh colour. It is fo foft as to be 
