100 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[no. 
F. Orendite, Fifteenmile Spring, Leucite Hills. Orendose. Con- 
tains predominating leucite and sanidine, with phlogopite, a little bio- 
tite, diopside, and amphibole, and accessory apatite and rutile. Sp. 
gr., 2.680, 23.5°. P. R. C. 72 and 572. 
G. Orendite, North Table Butte, Leucite Hills. Orendose. Com- 
position like F. Sp. gr., 2.699, 19°. P. R. C. 570. 
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 con- 
taining plagioclase, orthoclase, quartz, and magnetite. Sp. gr. , 2.576, 
26.2°. P. R. C. 159. 
Si0 2 .. 
M 2 3 . 
Fe 2 3 
FeO.. 
MgO. 
CaO.. 
Na 2 0. 
H 2 oatll0°.... 
H 2 above 110 c 
Ti0 2 
Zr0 2 
V 2 3 
Cr 2 3 
NiO. 
MnO 
SrO. 
BaO. 
Li 2 
so 3 . 
co 2 . 
CI — 
F... 
LessO. 
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 
.05 
.20 
.67 
trace 
.29 
.04 
.49 
99.98 
.21 
).77 
<;. 
54.17 
10.16 
3.34 
.65 
6.62 
4.19 
1.21 
11.91 
.52 
1.01 
2.67 
1.59 
99 
.05 
trace 
.06 
.18 
.59 
trace 
.16 
.49 
.06 
.36 
li. 
100. 21 
.17 
100. 04 
58.13 
11.72 
3.01 
1.01 
5.79 
2.24 
1.36 
12. 58 
.99 
1.16 
1.48 
.32 
undet. 
trace 
.10 
.29 
trace 
.13 
trace 
trace 
100. 31 
50.86 
1.19 
1.82 
17. 42 
23.32 
.76 
.42 
.31 
3.03 
03 
99.16 
67.78 
16.67 
1.99 
.51 
.71 
2.67 
4.91 
3.43 
1.44 
19 
trace 
100. 30 
