218 
ANALYSES OF ROCKS, IT. S. GEOLOGICAL SURVEY. 
[no. 228. 
F. Quartz-basalt, one-half mile south of Cinder Cone, on border of 
lava, held. Camptonose. Analysis by Hillebrand, No. Wii. P. R. C. 
791. 
G. Quartz-basalt, west end of Like Bidwell, on border of Cinder 
Cone lava field. Andose. Contains a few grains of quartz, much 
olivine and plagioclase, less pyroxene, and a globulitic base. Analysis 
by Hillebrand, No. 661. P. R. C. 795. 
H. Quartz-basalt, Silver Lake, near Lassen Peak. Andose. Con- 
tains occasional grains of quartz, much feldspar and olivine, less 
pyroxene, and a brownish base. Analysis by Hillebrand, No. 662. 
P. R, C. 790. 
I. Quartz-basalt, resting on dacite, near west base of Lassen Peak. 
Bandose. Analysis by Hillebrand, No. 677. ' P. R. C. 796. 
J. Quartz- basalt, island of Mitylene, coast of Asia Minor. Tonalose. 
Analysis for comparison with the Cinder Cone series, by T. M. 
Chatard, record No. 815. 
Rocks F to I dried at 100° to 110° before analysis. 
G. 
Si0 2 
A1A 
FeA 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 at 105 c 
H 2 
TiO, 
54.56 
16.04 
.95 
6.07 
8.71 
8.89 
3.05 
1.18 
56. 18 
16.59 
1.51 
5.51 
7.26 
7.64 
3.58 
1.47 
MnO 
SrO. 
BaO. 
Li 2 
CO, . 
.28 
.53 
.18 
trace 
.17 
trace 
.03 
trace 
100. 64 
.42 
undet. 
undet. 
undet. 
(?) 
(?) 
(?) 
100. 16 
ii. 
57. 59 
16.49 
1.22 
4.89 
7.72 
7.40 
3. 62 
.99 
.86 
undet. 
undet. 
undet. 
(?) 
(?) 
(?) 
100. 78 
156.51 
18.10 
4.26 
2.68 
4.52 
8.15 
3.23 
1.15 
.69 
.48 
.14 
trace 
.11 
.04 
.04 
trace 
100. 10 
J. 
56. 58 
14.88 
2.31 
3.04 
3.76 
8.69 
3.36 
2.18 
.69 
1.43 
.77 
.15 
trace? 
.16 
07 
2.32 
100. 3S 
K. Recent basalt, Pit River. Rich in feldspar and augite, poor it 
olivine. Partial analysis by F. W. Clarke, record No. 109. 
L. Basalt, 1 mile southeast of Paynes Creek, on the road from Red 
Bluff to Lassen Peak, Auvergnose. A normal basalt, rather rich id 
olivine. Analysis 1>\ T. M. Chatard, record No. 105. 
