IGNEOUS AND CRYSTALLINE ROCKS. 
63 
I. Nepheline-basalt, Black Mountain, Uvalde quadrangle. Contains 
olivine, augite, nephelite, magnetite, and apatite. Sp. gr. 3.200, 
21.5°. P. P. A. 1066. 
J. The portion of I soluble in 1 : 40 dilute nitric acid. 
K. Augite from I. Violet in color, very pure. 
L. Nepheline-melilite-basalt, from about 3* miles southwest of 
Uvalde. Contains nephelite, melilite, olivine, augite, magnetite, 
and apatite. Sp. gr. 3.150, 20.5°. P. P. C. 1064. 
M. The portion of L soluble in 1:40 dilute nitric acid. 
I. 
J. 
K. 
L. 
M. 
Si0 2 
39.92 
8.60 
4.40 
8.00 
20.17 
10.68 
1.91 
1.03 
.43 
1.45 
2.70 
.51 
none 
.14 
.04 
.06 
.24 
.04 
.06 
trace 
12. 00 
5.15 
45.23 
7.73 
2.95 
4.07 
12.25 
23.37 
.47 
.12 
} .37 
4.28 
none 
37.96 
10.14 
3.69 
7.59 
14.69 
16.28 
2.18 
.69 
.39 
1.82 
2.93 
1.13 
none 
.08 
.05 
.04 
.22 
.05 
.06 
trace 
.03 
.04 
trace 
.07 
19. 32 
7.12 
A1 2 3 
Fe 2 3 
FeO 
3.38 
7.16 
1.33 
1.77 
.77 
(?) 
(?) 
3.16 
6.52 
• 7.75 
2.11 
.67 
(?) 
(?), 
trace 
1.13 
MgO 
CaO 
Na 2 
K 2 
H 2 at 110° 
H 2 at above 110°... 
Ti 2 
P 2 0, 
.51 
Zr0 2 
Cr 2 3 
V 2 3 

MO 
.05 
.07 
none 
none 
trace 
MnO 
SrO 
BaO 
Li 2 
S0 3 
s 
trace 
trace 
.07 
CI 
F 
Less O 
100.45 
.03 
32.07 
100. 96 
100. 13 
.03 
47.78 
100. 42 
100. 10 
