126 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[no. 228. 
F. Camptonite (?), dike in Stinking-water Canyon. Andose. See 
Iddings, Bull. Phil. Soc. Washington, vol. 12, p. 205. Analysis by 
Melville, No. 1232. 
G. Kersantite, Bighorn Pass. Kentallenose. Described by Iddings 
in Mon. XXXII, Pt. II. Contains hornblende, plagioclase, ortho- 
clase, quartz, augite, biotite, magnetite, chlorite, calcite, and apatite. 
Augite and hornblende partly decomposed. Analysis by Whitfield, 
No. 714. 
H. Basalt, dike, north spur of Mount Washburn. Andose. Analy- 
sis by Whitfield, No. 717, hitherto unpublished. Reported by Iddings 
as approaching pyroxene-andesite in composition. Contains labrado- 
rite, augite, serpentinized olivine, and magnetite, in a groundmass of 
globulitic and microlitic brown glass. 
Si0 2 
ALA 
Fe 2 3 
FeO 
MgO 
CaO.. 
Na 2 
K 2 
H 2 at 100° .... 
H 2 above 100° 
Ti0 2 
PA 
MnO 
NiO 
BaO 
Li 2 
S0 3 
CI 
CO, 
50. 99 
15.62 
8.47 
1.43 
5.23 
8.53 
3. 39 
3.05 
1.39 
2.48 
.67 
.53 
trace 
.07 
99.85 
48.73 
11.92 
4.79 
4.56 
5.93 
9.24 
2.62 
2.47 
1.52 
1.34 
.32 
.36 
trace 
trace 
.34 
.11 
5.80 
100. 05 
M. 
53.75 
20.75 
4.50 
3.53 
3.76 
7.18 
4.16 
1.37 
1.55 
none 
.15 
trace 
trace 
trace 
none 
none 
100. 70 
