114 
ANALYSES OF ROCKS, 17. S. GEOLOGICAL SURVEY. 
[NO. 228. 
E. Augite-andesite, Dike Mountain. Shoshonose. Contains augite, 
plagioclase, serpentinized olivine, magnetite, and apatite. 
F. Trachyte-andesite, Dike Mountain. Akerose. Contains plagio- 
clase, orthoclase, chlorite, apatite, and magnetite. Very little augite. 
G. Biotite-trachyte, Dike Mountain. Nordmarkose. Contains 
plagioclase, orthoclase, biotite, magnetite, and chlorite. 
H. Biotite-trachyte, Dike Mountain. Pulashose. Contains ortho- 
clase, plagioclase, biotite, and magnetite. 
Si0 2 
A1A 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oat 110° .. 
H 2 above 110 
Ti0 2 
PA 
Zr0 2 
CrA 
VA 
NiO 
MnO 
SrO 
BaO '__ 
Li 2 
C0 2 
FeS 2 
51.17 
16.14 
4.11 
4.48 
4.82 
7.72 
2.99 
3.54 
.63 
2.24 
1.01 
.48 
none 
trace 
.04 
.01 
.21 
.10 
.20 
trace 
none 
.05 
99. 94 
52.47 
18.23 
3.31 
3.85 
2.85 
4.56 
4.83 
3.81 
.68 
2.03 
.97 
.64 
.02 
trace 
.03 
trace 
.15 
.11 
.23 
trace 
1.01 
.04 
99.82 
63.24 
17.98 
2.67 
.85 
.63 
.93 
6.27 
5.47 
.37 
.80 
.38 
.22 
trace 
none 
.01 
none 
.04 
.03 
.25 
trace 
none 
trace ■ 
100. 14 
n. 
57. 73 
18.93 
1.97 
1.92 
.91 
2.78 
5.52 
6.11 
.22 
2.93 
.33 
.25 
trace 
trace 
.01 
trace? 
.06 
.09 
trace 
.26 
.02 
100. 20 
