86 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
F. Orendite, Fifteenmile Spring, Leucite Hills. Contains predomi- 
nating- leucite and sanidine, with phlogopite, a little biotite, diopside, 
and amphibole, and accessory apatite and rutile. Sp. gr. 2.686, 23.5°. 
G. Orendite, North Table Butte, Leucite Hills. Composition like F. 
Sp. gr. 2.699, 19°. 
H. Groundmass of F. Sp. gr. 2.615, 19°. Not cited in published 
paper. 
I. Diopside separated from mixed wyomingite and madupite. Sp. 
gr. 3.290, 20°. Analyzed in the Denver laboratory. P 2 5 included 
with Ti0 2 . 
J. Dacite?, Garfield Peak. Phenocrysts of plagioclase and horn- 
blende, with microscopic sphene and apatite in a groundmass- contain- 
ing plagioclase, orthoclase, quartz, and magnetite. Sp. gr. 2.576, 26.2°. 
P. R. C. 159. 
F. 
G. 
H. 
I. 
J. 
Si0 2 
54.08 
9.47 
3.19 
1.03 
6.74 
3.55 
1.39 
11.76 
.79 
2.71 
2.08 
1.36 
undet. 
.02 
.07 
54. 17 
10.16 
3.34 
.65 
6.62 
4.19 
1.21 
11.91 
.52 
1.01 
2.67 
1.59 
.22 
58.13 
11.72 
3.01 
1.01 
5.79 
2.24 
1.36 
12.58 
.99 
1.16 
1.48 
.32 
undet. 
50. 86 
1.19 
1.82 
17.42 
23. 32 
.76 
.42 
67.78 
16.67 
1.99 
.51 
.71 
2.67 
4.91 
3.43 
| 1.44 
A1 2 3 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oat 110°... 
H 2 above 110° ..... 
Ti0 2 
.31 
3.03 
P„0, 
.19 
Zr0 2 
V 9 0, 
Cr 2 3 ... 
.05 
trace 
.06 
.18 
.59 
trace 
.16 
.49 
.06 
.36 
MO.. 
MnO 
.05 
.20 
.67 
trace 
.29 
trace 
.10 
.29 
trace 
.13 
.03 
trace 
SrO 
BaO.. 
Li 2 
SO, 
co 2 
CI 
.04 
.49 
trace 
trace 
F 
Less O. ............. 
99.98 
.21 
100. 21 
.17 
100. 31 
99.16 
100. 30 
99.77 
100. 04 
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