APP. 14’ I.] 
MINERALOGY”. 
40& 
IV. Specimens from Traill Island. 
i 
Trap Rocks. 
1. Greenstone. 
2. Decomposed felspathose greenstone, with disseminated 
iron-pyrites. 
3. Compact felspar, inclining to claystone. 
4. Compact felspar, tinged green, with augite or horn¬ 
blende. 
5. Grey compact sandstone, with disseminated iron-py¬ 
rites. 
6. Quartzy sandstone. 
* Porphyry rocks. 
7. Rock crystal. 
8. Statc-clay , inclining to bituminous shale. Some va¬ 
rieties incline to slaty compact felspar, as is shewn* 
by the white crust. 
9. Compact slate-clay, with waved structure. 
10. Slate-clay, with concentric lamellar structure. 
11. Calcareous slate-clay. 
12. Porphyry. 
13. Porphyry, highly crystallised. 
14. Porphyry, with cubic iron-pyrites. 
15. Porphyry, with abundant cubic iron-pyrites. The 
mass principally compact felspar. 
16. Weathered porphyry,—the reddish crust owing to* 
decomposing iron-pyrites. 
17. Vesicular porphyry, with imbedded quartz crystals 
and iron-pyrites. 
18. Claystone porphyry, with imbedded crystals of quart*: 
and felspar. 
c c 3 
