132 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[BULL. 168. 
F. Syenite, top of Palisade Butte. Contains augite, iron ore, apa- 
tite, alkali feldspar, a little biotite, some limonite in cracks, much 
natrolite, and possibly other zeolites. H. W. Foote, analyst. 
G. Leucite-syenite, head of Davis Creek. Contains augite, iron 
ore, olivine, biotite, apatite, alkali feldspar, leucite, and some zeolites, 
with traces of limonite and serpentine. E. B. Hurlbut, analyst. 
H. Monchiquite, dike east side of Highwood Gap. Contains augite, 
olivine, biotite, iron ore, apatite, and analcite, with some serpentine 
and a little kaolin. H. W. Foote, analyst. 
I. Leucite-basalt, saddle between Highwood and Pinewood peaks. 
Contains augite, iron ore, leucite, apatite, altered olivine, chlorite, 
calcite, and zeolites. H. W. Foote, analyst. 
J. Leucite-basalt or leucite-monchiquite, dike on Arrow Peak. 
Phenocrysts of augite, olivine, and biotite, with some leucite, in a 
groundmass of the same minerals. Also analcite, iron ore, and apatite. 
H. W. Foote, analyst. 
Si0 2 .. 
A1 2 3 - 
FeA 
FeO.. 
MgO . 
CaO.. 
Na 2 0. 
H 2 0. 
Ti0 2 . 
PA 
MnO 
SrO. 
BaO. 
S0 3 . 
C0 2 . 
CI... 
Less O. 
F. 
50.11 
17.13 
3.73 
3.28 
2.47 
5.09 
3.72 
7.47 
4.47 
.82 
.67 
trace 
.35 
.63 
.08 
07 
100. 09 
.02 
100. 07 
49.59 
14.51 
3.51 
5.53 
6.17 
9.04 
3.52 
5.60 
1.95 
.36 
.15 
trace 
.21 
.49 
.02 
.13 
100. 78 
.03 
100. 75 
47.82 
13.56 
4.73 
4.54 
7.49 
8.91 
4.37 
3.23 
3.37 
.67 
1.10 
trace 
.21 
.16 
trace 
.04 
100. 20 
.01 
100. 19 
47.98 
13.34 
4.09 
4.24 
7.01 
9.32 
3.51 
5.00 
2.10 
.58 
1.03 
trace 
.14 
.50 
trace 
1.24 
.21 
100. 29 
.07 
100. 22 
46.04 
12.23 
3.86 
4.60 
10.38 
8.97 
2. 42 
5.77 
2.87 
.64 
1.14 
trace 
.25 
.48 
trace 
.11 
99.76 
.03 
99.73 
