146 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [bull. 168. 
G. Analcite-basalt, from the Basin. Contains phenocrysts of augite, 
olivine, and analcite. Also magnetite, with subordinate amounts of 
alkali feldspars, biotite, and apatite. 
H. Portion of the analcite-basalt soluble in hydrochloric acid. 
I. Augite separated from G. 
J. Analcite separated from G. After deduction of 4 22 per cent of 
substance insoluble in boiling dilute hydrochloric acid, and later 
removal of liberated silica with weak potash solution. Sixty-two one 
hundredths per cent of the water goes off over sulphuric acid. A trace 
of lithia was found. 
The analcite-basalt and its fractions are described by Cross in Journ. 
Geol., vol. 5, p. 684. 
Si0 2 
A1 2 3 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oatl00°... 
H 2 above 100 
Ti0 2 
PA 
Zr0 2 
MnO 
SrO 
BaO 
CI 
G. 
45.59 
12.98 
4.97 
4.70 
8.36 
11.09 
4.53 
1.04 
.51 
3.40 
1.32 
.91 
.03 
.14 
.12 
.13 
.05 
99.87 
44.44 
a 20. 11 
7.50 
5.81 
3.94 
8.17 
1.13 
7.91 
trace 
.16 
(?) 
.10 
99.27 
49.26 
6.01 
3.31 
4.23 
12.40 
21.79 
.79 
.41 
undet. 
undet. 
1.53 
J. 
undet. 
.06 
(?) 
99.79 
51.24 
24.00 
1.20 
.33 
1.62 
11.61 
1.25 
9.09 
06 
trace 
100. 40 
a Includes P 2 5 and possible Zr0 2 and Ti0 2 
