40 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
M. Aplite (alsbachite), Fallon Hill, Entield. Kallerudose. Gar- 
netiferous biotite-granite dike. 
N. Another sample, same locality as M. Lassenose-alsbacJwse. 
Analyses M, N, by George Steiger, record No. 1975. 
O. Quartz-diabase, west of Ashley reservoir, Holyoke. Vaalose. 
Contains calcite and radiated quartz. 
P. Palagonite, from blebs in O. 
Analyses O. P, by Steiger, No. 2039. 
Si0 2 .. 
A1A- 
Fe 2 .0 3 
FeO.. 
MgO 
CaO 
Na 2 
K 2 
H 2 Oat 105°... 
H 2 above 105 c 
Ti0 2 
Zr0 2 
co 2 .. 
PA 
s 
MnO 
77. 00 
13. 60 
.41 
none 
.70 
5.78 
1.50 
.23 
.48 
.07 
trace 
99: 
73. 09 
13.42 
1.44 
1.13 
.35 
1.89 
4.52 
1.59 
.47 
1.41 
.20 
05 
.10 
99. 72 
o. 
53.52 
9.70 
8.06 
9.45 
2.52 
5.64 
2.24 
1.50 
1.67 
2.16 
1.98 
.03 
1.02 
.36 
.10 
.26 
100. 21 
40. 35 
5.11 
24.99 
3.55 
5.48 
1.32 
.18 
1.44 
8.51 
8.51 
.20 
none 
.22 
•99. 86 
