CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
269 
Rocks K to S. Collected by J. E. Spun*. Rocks K to Q are 
described b}^ him in Amer. Geologist, vol. 25, p. 210. Analyses by 
H. N. Stokes, record Nos. 1809 and 1822. 
K. Alaskite, Chilkoot Pass. Liparose. Dike in granite. Contains 
quartz, orthoclase, and some twinned feldspars, accessory zircon, acti- 
nolite, magnetite, and siderite. 
L. Alaskite-porphyry, Fortymile Creek, near Canj'on Creek. Las- 
senose. Dike. Contains quartz, orthoclase, and some plagioclase, with 
accessory biotite and epidote. 
M. Alaskite, Skwentna River, 12 miles above its mouth. Toscanose. 
Dike. Contains quartz, orthoclase, and microcline, with no dark 
minerals. 
N. Alaskite, Tordrillo Mountains. Alashose. Dike. Consists of 
quartz, orthoclase, and microcline, with no dark minerals. P. R. C. 
1275. 
Si0 2 ...-- 76.30 
A1 2 3 12. 50 
FeA 
FeO 
MgO 
CaO 
Na 2 
K 2 
Ti0 2 . 
BaO. 
SrO . 
Li 2 0. 
1. 47 
none 
.17 
3.86 
4.67 
.18 
.32 
.05 
.07 
none 
none 
99. 59 
67.01 
17. 91 
1.30 
.42 
1.86 
5.33 
4.56 
.16 
.48 
.10 
.60 
.13 
none 
99.86 
M. 
75.01 
13. 88 
.74 
.09 
1.00 
3.52 
4.89 
.11 
.26 
. 06 
. 10 
trace 
truce 
99. 66 
77.33 
12.55 
.91 
.10 
.17 
3.19 
4.80 
.15 
.53 
.09 
trace 
trace 
trace 
99. 82 
In K to N there are traces of P 2 5 but no C0 2 . Manganese is also present in traces. 
