NATURAL HISTORY. 
mouth wharf, and in all probability came 
from the Haytor granite quarries —this 
specimen with which we have been most 
obligingly favoured, is a remarkably fine 
one. 
Mica—well defined specimens for the Cabinet are 
occassionally, tho’ rarely, met with im 
the granite formation. 
Hexagonal prisms of a dark green co~ 
lour occasionally occur—we have a spe- 
cimen from the neighbourhood ef Mana- 
ton—in granite of a coarse and open 
texture, 
FELSPAR, 
Common—well defined crystals of various sizes, 
usually white or flesh red—are frequent 
in the granite. 
Manganesian rose coloured—in a decomposing 
state; from the Hightor works; ‘‘often 
approaching asparagus stone, from the 
same place.” J. G.Croker, Esq. 
ScHORL. 
Crystallized—in longitudinal deeply striate prisms 
occassionally term imated by three planes; 
of various sizes, sometimes large and 
distinct ; sometimes small and very closely 
aggregated ; fine specimens may fre- 
quently be obtained from old stream-works 
in the granite. 
Pitcn Stone—“coating scopiform hornblend 1 
inch thick, near the Hon, Capt. Pellew’s 
