136 
ANALYSES OF ROCKS, U. S; GEOLOGICAL SURVEY. 
[BULL. 168. 
D. Shonkinite, Beaver Creek. Contains anorthoclase, diopside, bio- 
tite, iron oxides, and apatite, with very little olivine and probably a 
trace of nephelite. P. R. C. 901. 
E. Leucitite, Bearpaw Mountains. An olivine-free leucite-basalt. 
Contains leucite, augite, iron oxides, rarely biotite, and very little 
glassy base. P. R. C. 903. 
F. Tinguaite, dike on Bear Creek. Contains orthoclase, nephelite, 
cancrinite, augite, aBgirite, apatite, a little sodalite, and a doubtful 
fibrous hornblende. P. R. C. 899. 
G. Pseudo leucite - sodalite - tinguaite, Beaver Creek. Contains 
orthoclase, nephelite, sodalite, nosean, segirite, diopside, and lluorite. 
P. R. C. 904. 
SiO, 
Fe 2 3 ... 
FeO 
MgO 
CaO 
NslO 
K 2 
H 2 at 110°... 
H 2 above 110 c 
Ti0 2 
Cr 2 3 
NiO. 
CoO. 
MnO 
CuO. 
SrO . 
BaO. 
so 3 
co 2 
CI- 
F .. 
LessO. 
50.00 
9.87 
3.46 
5.01 
11.92 
8.31 
2.41 
5.02 
.17 
1.16 
.73 
.81 
.11 
.07 
trace 
.07 
.32 
trace 
.02 
.31 
.08 
.16 
100. 01 
.08 
99.93 
46.51 
11.86 
7.59 
4.39 
4.73 
7.41 
2.39 
8.71 
1.10 
2.45 
.83 
.80 
none 
.04 
trace 
.22 
trace 
.16 
.50 
trace 
.05 
none 
.04 
trace- 
99.78 
.02 
57.46 
15. 40 
4.87 
.87 
1.37 
2.59 
5.48 
9.44 
.09 
.82 
.60 
.21 
trace 
.16 
.60 
trace 
.13 
.13 
.20 
trace 
100. 42 
.05 
100. 37 
51. 93 
20. 29 
3.59 
1.20 
.22 
1.65 
8.49 
9.81 
.10 
.99 
.20 
.06 
.07 
.09 
trace 
.67 
.25 
.70 
.27 
100. 58 
'.27 
trace 
100. 31 
