APR. N° I.] 
MINERALOGY. 
405 
which maintains the volcanic origin of such greenstone and 
porphyry rocks. 
V. Specimens from Cape Brewster. 
1. Greenstone. 
2. Greenstone,—secondary. 
3. Decayed greenstone. 
4. Botryoidal calcedony. 
5. Common calcedony, inclining to splintery quartz. 
6. Calcedony and grey amethyst. 
7. Crystallised white amethyst and calcedony. 
8. Calcedony and green earth. 
9. Composed of calcedony, cacholong, and fibrous zeolite. 
10. White amethyst. 
11. Amygdaloid. 
12. Coarse brown coal. 
13. A specimen of agate, composed of calcedony and 
cacholong. 
Remarks. —This headland, from the specimens collect¬ 
ed, appears to be composed of rocks of the secondary trap 
series, and to have the same general and particular charac¬ 
ters as that formation exhibits in this country in the 
Islands of Mull, Canna, Skye, &c. The brown coal would 
seem to shew, that the trap-rocks here arc probably asso¬ 
ciated with a new limestone or sandstone formation, and 
not with the old coal formation, such as that of Jameson’s 
Land, which docs not contain true brown coal. 
VI. Loose Specimens. 
Loose Specimens,—locality not known. 
1. Mixture of talc and mica. 
2. Primitive clay-slate. 
