1 
34 MINERALOGICAL 
wall, and is feparated by wafhing. That 
from St. Stephens is principally ufed for 
porcelain : of the other lefs pure forts ve¬ 
ry good crucibles are made. 
Talc and afheitos are found in the fer- 
pentine rock near Cape Lizard. 
Mica of a grey colour and lamellar 
texture is to be met with at St. Dennis; 
and Black Bar-Shoerl imbedded in gra¬ 
nite is found at Logan Rock near the 
Lands-end. 
This ihort mineralogical view of my 
collection of Cornifh foffils, muft not bei 
as I have already mentioned, confidered 
as complete, many additions being ne- 
ceffary to it. 
I fhall now proceed to give an account 
of fome chemical analyfes, which I have 
made of them. 
CHEMICAL 
