IGNEOUS AND CRYSTALLINE ROCKS. 
L63 
(t. Trachytic phonolite, dike on west slope of Bull Cliff. Miaskose. 
Contains alkali feldspars, nepheline, nosite, sodalite, augite, scanty 
segirine, brown hornblende, magnetite, sphene, apatite, and sometimes 
lavenite. P. R. C. 624. 
H. Altered phonolite, Washington shaft, Victor. Contains potash 
feldspars, with some alteration to muscovite. Crystals of pyrite and 
fluorite are visible, but nepheline and segirine have disappeared. 
Analysis hitherto unpublished. P. R. C. 623. 
I. Nepheline-syenite, near the Longfellow mine. Akerose. Con- 
tains alkali feldspars, nepheline, sodalite, augite, some aagirine, horn- 
blende, biotite, sphene, apatite, and magnetite. Sp. gr., 2.68, 23°. 
P. R. C. 626. 
J. Nepheline-basalt, Appie Ellen shaft. Much altered. Rich in 
olivine, augite, and magnetite. Also contains nepheline, feldspars in 
small amount, and biotite. Sp. gr., 2.99, 23°. 
K. Altered nepheline-basalt, Anna Lee mine. Analysis hitherto 
unpublished and not discussed. 
L. Local facies of a phonolitic mass, Bull Cliff. Akerose. Con- 
tains abundant augite, plagioclase, alkali feldspar, magnetite, and a 
little red-brown biotite, with a colorless isotropic base in the darker 
spots. Analysis hitherto unpublished. P. R. C. 627. 
Si0 2 .. 
A1 2 3 . 
Fe 2 3 
FeO.. 
MgO. 
CaO.. 
Na 2 0. 
K 2 0. 
H 2 above 110 c 
Tib 2 
PA 
Zr0 2 
Cr 2 3 
VA 
MnO 
SrO 
BaO 
Li 2 
S0 3 
CI 
F 
co 2 
FeS, 
59.38 
17 
60 
I!) 
36 
96 
so 
83 
11 
69 
58 
OS 
10 
.15 
.03 
.13 
trace 
.37 
.22 
100. 05 
56. 74 
20. 30 
1.06 
"".~23" 
.57 
.62 
13.36 
.33 
1.15 
.58 
.25 
.07 
none 
trace 
.19 
trace 
undet. 
"~4."65 
100. 10 
54.34 
19.21 
3.19 
2.11 
1.28 
4.53 
6.38 
5.14 
.14 
1.17 
1.09 
.27 
.07 
.02 
.08 
.16 
.24 
trace 
.07 
.28 
undet. 
none 
99.77 
35. 03 
0. so 
5.55 
4.98 
9.78 
15. 09 
2.04 
2.16 
.41 
2.05 
2.20 
1.99 
none 
.06 
.17 
.14 
trace 
none 
trace 
undet. 
7.83 
.38 
48. 61 
20. 74 
4. 29 
.22 
2.11 
.25 
.16 
. 77 
12. 10 
7.07 
3.57 
.29 
trace 
none 
none 
none 
(?) 
63 
100. 81 
49.84 
17.75 
5.86 
2.62 
3. 02 
.35 
.20 
.04 
.34 
.02 
.43 
.70 
.03 
.03 
.21 
.18 
.22 
trace 
none 
trace 
undet. 
.52 
100. 42 
