110 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[bull. 168 
F. Camptonite (?), dike in Stinkingwater Canyon. See Iddings. 
Bull. Phil. Soc. Washington, vol. 12, p. 205. Analysis by Melville. 
No. 1232. 
G. Kersantite, Bighorn Pass. Described by Iddings in Mon. XXXI I. 
Pt. II. Contains hornblende, plagioclase, orthoclase, quartz, augite. 
biotite, magnetite, chlorite, calcite, and apatite. Augite and horn 
blende partly decomposed. Analysis by Whitfield, No. 711. 
H. Basalt, dike, north spur of Mount Washburn. Analysis by 
Whitfield, No. 71T, hitherto unpublished. Reported by Iddings as- 
approaching pyroxene-andesite in composition. Contains labradorite. 
augite, serpentinized olivine, and magnetite, in a groundmass of globu- 
litic and microlitic brown glass. 
Si0 2 .. 
A1 2 3 . 
Fe 2 3 
FeO.. 
MgO . 
CaO.. 
Na 2 0. 
H 2 Oatl00° .., 
H 2 above 100 c 
Ti0 2 ........ 
PA 
MnO 
NiO 
BaO 
S0 3 
CI.. 
CO, 
50. 99 
15.62 
8.47 
1.43 
5.23 
6.53 
3.39 
3.05 
1.39 
2.48 
.67 
.53 
trace 
.07 
99.85 
G. 
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 
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 
