Ilabke.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
195 
few decomposed grains of noselite or sodalite. Sp. gr. , 2.619, 22 ; 
40. S per cent soluble in dilute (1:40) nitric acid, of which soluble 
portion 43.5 per cent is silica. P. R. C. 1334. 
B. Pyroxene-andesite, Sierra Grande. Tonalose. Contains augite, 
less hypersthene, microliths of plagioclase, apatite, magnetite, and 
a smoky-brown glassy base. Sp. gr., 2.035, 21°. P. R, C. 1335. 
C. Plagioclase-basalt, end of San Rafael flow. Gamptonose. Con- 
tains plagioclase, augite, olivine, with much iddingsite, magnetite, 
and apatite. Sp. gr., 2.970, 21.5°. P. R. C. 1336. 
D. Nepheline-basanite, Ciruella. Limburgose. Contains augite, 
olivine, nephelite, plagioclase, magnetite, apatite, and a little biotite. 
Sp. gr., 3.122, 22°. 0.55 per centK 3 and 2.10 per cent Na 3 soluble 
in 1:40 nitric acid. P. R. C. 1337. 
A. 
B. 
c. 
r, 
I< )., 
56. 24 
21.43 
2.01 
.55 
.15 
1.38 
10. 53 
5.74 
.12 
.86 
.26 
.06 
.09 
none 
60. Ki 
15.34 
3.07 
2.18 
3.41 
5.79 
3. 88 
2.59 
.25 
1.79 
.84 
.46 
.01 
trace? 
is.:;;, 
15.47 
4.80 
7. 58 
8.15 
8.81 
3.09 
.95 
.28 
.73 
1.33 
none 
trace 
42.35 
lux. 
1 2. 29 
Fe,0,- 
3.89 
FeO 
7.05 
MgO 
CaO 
13.09 
12.49 
Na 2 
2.74 
K,( ) 
1.04 
H 2 ( ) at 110° 
.32 
» 2 above 110° 
Ti0 2 
P 2 5 
1.50 
1.82 
.99 
Zr0 2 
Cr 2 3 
none 
.10 
V,0, 
.04 
NiO, CoO 
none 
.08 
.03 
.08 
t rare 
.10 
.03 
.12 
trace 
trace 
.08 
.08 
.14 
trace 
.08 
trace 
undet. 
undet. 
.02 
.21 
.03 
.06 
trace 
.07 
trace 
undet. 
undet. 
.03 
MnO 
.21 
SrO . . . . 
.09 
BaO 
.10 
Li.,0 
trace 
SO , 
.05 
s._ 
trace 
CI 
undet. 
F 
undet. 
99.86 
100. 15 
100. 26 
100. 19 
