184 CHEMICAL ANALYSES. 



TKAOHYTE, CANONS OF GILA EIVER. 



Specific gravity, 2.64. 



Silica 57.15 



Alumina 16.90 



Oxide of iron 8.50 



Oxide of manganese .04 



Magnesia 1.86 



Lime 6.40 



Potassa 3.80 



Soda 1.10 



Water 3.28 



99.03, in 100 parts. 



6. ARGENTIFEROUS GALENA, ORGAN MOUNTAINS, WEST SIDE, STEVENSON'S 



MINE. 



Specific gravity, 7.8. 



Lead 86.40 



Sulphur 13.34 



Silver 16 



Manganese .20 



100.00 



7. ARGENTIFEROUS GALENA, EAST SIDE OF ORGAN MOUNTAINS, FORT MINE. 



Specific gravity, 7.75. 

 Lead 86.00 



Silver 17 



Sulphur 13.36 



Manganese and antimony .67 



100.00 



8. SOIL, EIGHT MILES EAST OF FORT YUMA, CAMP ON GILA. 



Silica 81.22 



Alumina 8.00 



Peroxide of iron .67 



Oxide of manganese -07 



Lime 1.15 



Magnesia .71 



Potass 84 



Soda 76 



Carhonic acid 1.00 



Sulphuric acid .54 



