282 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY, 
[bull. 168. 
E. Red slate, from quarry 3 miles north of Raceville. 
F. Green spot in E. 
G. Purple rim of green spot F. 
Analyses by W. F. Hillebrand, record No. 1656. 
Si0 2 
ALA 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 at 110° . . .•. 
H 2 above 110° 
Ti0 2 
PA 
MnO 
BaO 
C0 2 
FeS 2 
63.88 
9.77 
3.86 
1.44 
5.37 
3.53 
.20 
3.45 
.27 
2.48 
.47 
.08 
.21 
.05 
5.08 
trace 
100. 14 
65.44 
9.38 
1.09 
1.06 
4.92 
4.53 
.22 
3.57 
.25 
2.10 
.52 
.08 
.32 
.06 
6.55 
.04 
100. 13 
64.59 
10.23 
1.79 
1.19 
5.12 
4.07 
.23 
3.70 
.28 
2.29 
.51 
.08 
.26 
.05 
5.84 
trace 
100. 23 
Contain traces of lithia and nickel. Fluorine not determined. 
