Analysis of Ores from North Carolina. 351 



No. 7. By J. V. Z. Blaney. Black, copper chiefly as carbon- 

 ate, with oxide and sulphuret. 



MtMnls. 



Silver, .... 0.5 . 0.5 



Carbonate of lead, . . 1.8 . 1.5 



Do. of copp'r (oxide and sulphuret), 48.2 . 29.8 



<j3 f Oxide of iron, (trace of mangan.) 10.4 . 7.21 



gj J Silica, .... 20.0 



§ 1 Alumina, .... 5.2 39.01 



O I Magnesia, . . . . 13.7 



99.8 

 No. 8. Carbonate of lead with ferruginous gangue. By J. V. 

 Z. Blaney. 



Metals. 



Carbonate of lead (trace of copp'r), 81.80 . 62.82 



^ f Oxide of iron, . . . 12.00 . 8.32 



gj J Silica, .... 3.12 



§ I Alumina, . . . . 1.10 71.14 

 O I Magnesia, .... 0.40 



98.42 

 No. 9. Carbonate of lead with highly ferruginous gangue. By 

 Wm. M. Uhler. 



Mplnls. 



Carbonate of lead, . . 56.40 . 43.75 



Oxide of copper, . . 2.63 . 2.50 



zinc, . . . 0.17 . 0.137 



^ f " iron,(traceofmangan.) 18.60 . 12.897 



g. J Silica, .... 10.58 



§ I Ahimina, .... 3.66 59.284 



O I Magnesia, . . . . 6.17 



98.21 

 No. 10. Brownish yellow, and highly ferruginous. By H. C. 

 Lea. 



Moi.tIs. 



Carbonate of lead, . . 62.21 . 48.21 



Sulphuret of zinc, . . 6.00 . 4.00 



q5 ("Oxide of iron, (trace of mangan.) 23.70 . 16.432 



g, J Silica, .... 4.00 



§ I Alumina, .... 0.002 . 68.642 

 O I Magnesia, . . . . 3.103 



99.015 

 No. 11. Yellowish white or grey lead ore. By H. C. Lea. 



