:ke.] 
IGNEOUS AND CRYSTALLINE ROOKS. 
205 
2. MISCELLANEOUS ROCKS. 
A. Rhyolite, south-southeast of McClellan Peak, Washoe. Mihal- 
ose. Contains feldspars, orthoclase predominating over plagioclase, 
'! quartz, mica, and hornblende. 
B. Dacite, spur northeast of McClellan Peak. Toscanose. More 
plagioclase than orthoclase, much mica, less hornblende, little quartz. 
Rocks A and B are described by Hague and Iddings in Bull. 17. 
Analyses by F. A. Gooch, record Nos. 119, 129. FeO not separately 
determined. 
C. Basalt, summit of Richmond Mountain, Eureka. JETessose. Red, 
porous. Contains augite, less hypersthene, feldspars, and magnetite, 
in a glassy base, with accessory olivine and quartz. Analysis by J. 
E. Whitfield, record No. 121. 
D. Andcsitic perlite, south of Carbon Ridge, Eureka. Amiatose. 
Contains plagioclase, hornblende, biotite, quartz, hypersthene, augite, 
magnetite, apatite, and zircon, with a glassy base. Analysis by W. 
H. Melville, record No. 1210. 
Rocks C and D are described by Hague and Iddings in Mon. XX. 
E. Dacite, west side of Silver Peak range, south of Emigrant 
Road. Lassenose-toscanose. Collected by H. W. Turner; description 
hitherto unpublished. Contains phenocrysts of plagioclase, sanidine, 
possibly quartz, biotite, hornblende, augite, magnetite, and apatite. 
F. Spherulitic rhyolite, southeast of Red Mountain, Silver Peak 
range. Toscanose. Collected by Turner, unpublished. Contains sani- 
dine, quartz, biotite, titanite, magnetite, and zircon, in a spherulitic 
groundmass. 
Analyses E and F by George Steiger, record No. 1887. 
Si0 2 
A1 2 3 
Fe,0 3 
Feb.' 
MgO 
CaO 
|Na 2 
K 2 
H 2 Oatl05°.... 
B 2 above 105 c 
Ti( .), , 
1.0, 
73. 07 
11.78 
2.30 
.39 
2.02 
1.19 
6.84 
«2. 24 
69.96 
15. 79 
2.50 
.64 
1.73 
3.80 
4.12 
«1.53 
Zr0 2 . 
NiO. 
MnO 
BaO. 
Li 2 
SO, . 
99. 83 100. 07 
c. 
50. 38 
19. 83 
6.05 
2.00 
5.36 
10.03 
2.15 
1.76 
1.37 
38 
trace 
.83 
100. 14 
65.13 
15. 73 
2.24 
1.86 
1.49 
3.62 
2.93 
3.96 
.52 
1.91 
.58 
.23 
.07 
trace 
100. % 
69. 76 
14. 05 
2.05 
none 
.17 
1.73 
3.90 
3.57 
.62 
3.65 
.19 
.07 
72. 54 
13. 32 
2.41 
.09 
.51 
1.37 
none 
.03 
100. 00 
100. 62 
« Loss on ignition. 
