CLARKE.] 
IONEOI'S AND CRYSTALLINE ROCKS. 
133 
K. Missourite, head of Shonkin Creek. Described in Amer. Journ. 
Sci., 4th series, vol. 2, p. 315. Contains apatite, iron ore, olivine, 
biotite, augite, and leucite, the two latter being the chief minerals. 
Some zeolites and analcite are also present. E. B. Hurlbut, analyst. 
L. Pseudo leucite-syenite, head of Shonkin Creek. Contains augite, 
olivine, biotite, iron ore, apatite, orthoclase, nephelite, zeolites, and 
traces of serpentine, limonite, and kaolin. Contains pseudomorphs 
after leucite. E. B. Hurlbut, analyst. 
M. Monzonite, High wood Peak. Contains augite, biotite, iron ore, 
apatite, plagioclase, and alkali feldspar. E. B. Hurlbut, analyst. 
N. Monzonite, Middle Peak. Contains augite, olivine, biotite, iron 
ore, apatite, plagioclase, and orthoclase. The two latter, with augite, 
are the chief minerals. E. B. Hurlbut, analyst. 
Si0 2 ._ 
A1 2 3 . 
Fe 2 3 - 
FeO.. 
MgO . 
CaO.. 
Na 2 0. 
K 2 0.. 
H 2 0.. 
Ti0 2 . 
p 2 6 - 
MnO. 
SrO.. 
BaO.. 
S0 8 ... 
01.... 
Less O 
46.06 
10.01 
3.17 
5.61 
14.74 
10.55 
1.31 
5.14 
1.44 
.73 
.21 
trace 
.20 
.32 
.05 
.03 
99.57 
.01 
99.56 
51.75 
14.52 
5. 08 
3.58 
4.55 
7.04 
2.93 
7.61 
2.25 
.23 
.18 
trace 
.07 
.30 
trace 
.05 
100. 14 
.01 
100. 13 
51.00 
17.21 
2.41 
4.23 
6.19 
9.15 
2.88 
4.93 
.63 
.13 
.33 
trace 
.14 
.34 
.03 
trace 
99.60 
52. 05 
15. 02 
2.65 
5.52 
5.39 
8.14 
3.17 
6.10 
.35 
.47 
.21 
trace 
.28 
.42 
.02 
.24 
100.. 03 
.06 
The following rock and separations, from Square Butte, at the east 
end of the Highwood Mountains, are described by Lindgren in Amer. 
Journ. Sci., 3d series, vol. 45, p. 286. Analyses by W. H. Melville, 
record No. 1268. 
A. Post-Cretaceous sodalite-syenite. Contains orthoclase, some alb- 
ite, hornblende, sodalite, analcite, and apatite. Orthoclase predom- 
inates. The sodalite amounts to 8 per cent. P. R. C. 184. 
B. Hornblende separated from A. Near barkevikite. 
