CLARKE.] 
IGNEOUS AND CRYSTALLINE ROOKS. 
73 
I. Nepheline-basalt, Black Mountain, Uvalde quadrangle. Uvald- 
ose. Contains olivine, augite, nephelite, magnetite, and apatite. 
Sp. gr., 3.200, 21.5°. P. K. C. 1066. 
J. The portion of I soluble in 1:40 dilute nitric acid. 
K. Augite from 1. Violet in color, verj^ pure. 
L. Nepheline-melilite-basalt, from about 3 miles southwest of 
Uvalde. Casselose. Contains nephelite, melilite, olivine, augite, 
magnetite, and apatite. Sp. gr., 3.150, 20.5°. P. R. C. 1061:. 
M. The portion of L soluble in 1:40 dilute nitric, acid. 
Si0 2 
A1A 
FeA 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oat 110° 
H a O at above 110 c 
Ti0 2 
PA 
ZrO, 
Cr 2 :! 
VA 
NiO 
MnO 
SrO 
BaO 
Li 2 
so 3 
s 
CI 
F 
Lesa O . 
39. 92 
8.60 
4.40 
8.00 
20.17 
10.68 
L.91 
1.03 
.4:3 
1 . 45 
2.70 
.51 
none 
.14 
.04 
.06 
.24 
.04 
. 06 
trace 
trace 
trace 
.07 
100. 45 
. .03 
100. 42 
12.00 
5. 15 
3. 38 
7.16 
1.33 
1.77 
. 77 
CO 
(?) 
.51 
32. 0/ 
K. 
45. 28 
7.73 
2.95 
4 07 
12.25 
23. 37 
.47 
.12 
4.28 
none 
.05 
.07 
none 
none 
trace 
LOO. 96 
37. Mi 
10.14 
3.69 
7. 59 
14.69 
16.28 
2. is 
.69 
.39 
1.82 
2. 93 
1. 13 
none 
.08 
.05 
.04 
.22 
.05 
.06 
trace 
. 03 
.04 
trace 
.07 
100. 13 
.03 
100. 10 
19. 32 
7.12 
3. L6 
6. 52 
7.75 
2.11 
.67 
CO 
(?) 
trace 
1.13 
17 78 
