248 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
E. Crystalline gabbro, Bagley Creek. Kedabekose. Contains pla- 
gioclase and diallage. Record No. 1166. 
F. Shaly gabbro. Friable, containing carbonates and sulphates. 
Somewhat resembles serpentine. 
G. Shaly gabbro, like F, much resembling a true serpentine. 
According to Turner, F and G are merely weathered layers of the 
gabbro. 
E. 
F. 
G. 
Si0 2 
47.49 
15.81 
1.07 
4.50 
10. 39 
15. 53 
1.16 
trace 
1.20 
1.83 
trace 
.06 
.41 
45. 43 
12.55 
45. 69 
Al 2 3 
13. 30 
Fe 2 3 
1.85 
FeO 
6.50 
13.41 
12.39 
1.71 
.11 
2.41 
2.74 
.04 
4.72 
MrO 
13.06 
CaO 
13. 50 
Na 2 
1.36 
K 2 
trace 
H 2 at 105° 
2.29 
H 2 above 105° 
2.47 
P 2 5 
.06 
NiO 
MnO 
.21 
2.35 
.24 
trace 
.24 
C0 2 
1.89 
so 3 
43 
99.45 
100. 09 
100. 86 
