CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
125 
MISCELLANEOUS ROCKS. SECOND GROUP. 
Collected and investigated by Arnold Hague and J. P. Iddings. 
A. Pyroxenc-andesite, west of Dunraven Peak. Andose. Analysis 
by F. A. Gooch, record No. 116, hitherto unpublished. Reported by 
Iddings as containing labradorite, augite, hypersthene, and magnetite, 
in a microlitic groundmass. 
B. Basalt, southwest of Dunraven Peak. Camptonose. Analysis 
by Gooch, No. 118, hitherto unpublished. Reported by Iddings as 
containing augite, olivine, labradorite-bytownite, and magnetite, in a 
globulitic glaws}^ groundmass. 
C. Basalt, north spur of Prospect Peak. Auvergnose. Analysis by 
J. E. Whitfield, record No. 131, hitherto unpublished. Reported by 
Iddings as containing labradorite, augite, olivine, and magnetite. 
Little glass in groundmass. 
D. Basalt, Yellowstone Canyon. Andose. Analysis by Whitfield, 
No. 430, hitherto unpublished. Reported by Iddings as containing 
labradorite-bytownite, augite, olivine, magnetite, and a little brown 
glass. 
E. Basalt, Stinkingwater Canyon. Andose. See Iddings, Bull. 
Phil. Soc. Washington, vol. 12, p. 205. Analysis by W. H. Melville, 
record No. 1232. 
A. 
B. 
c. 
D. 
E. 
Si0 2 
A1 2 3 
56. 47 
15. 33 
2.54 
4.53 
5.08 
6.93 
3.81 
1.66 
| 1.65 
.99 
.54 
51. 70 
15.18 
2.09 
8.54 
8.18 
8.73 
2.31 
1.81 
} ■» 
1.24 
.21 
47.17 
17. 85 
7.42 
1.18 
6.54 
10. 12 
2. 94 
.56 
} .65 
2.13 
.20 
3.26 
none 
51. 70 
17. 90 
7.24 
1.00 
2.77 
6. 94 
4.17 
1.62 
1 1. 15 
3.17 
.41 
1,81 
trace 
52.37 
16. 57 
Fe 2 3 
6.34 
FeO 
2.35 
MgO 
5. 27 
CaO 
8.54 
Na 2 
2.99 
K 2 
2.45 
H a O at 100° 
1.18 
H 2 above 100° 
1.04 
Ti0 2 
.73 
P 2 5 
.31 
Fe, metal (doubtful) 
MnO 
.18 
trace 
.07 
NiO 
.12 
Li 2 
.02 
.51 
.03 
.32 
so 3 
s 
.09 
trace 
CI 
- 
99. 71 
100. 24 
100. 55 
100. 23 
100. 33 
