36 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
The following amphibolites, from Palmer Center, collected by 
Emerson, are hitherto undescribed. 
I. Amphibolite dike. 
J. Hornblende, separated from I. 
K. Feldspar, separated from I. 
L. Amphibolite bed. 
M. Hornblende, separated from L. 
N. Feldspar, separated from L. 
Analyses I to N by W. F. Hillebrand, record No. 1895. 
I. 
J. 
K. 
L. 
M. 
N. 
Si0 2 
49.57 
14.23 
3.95 
8.01 
6.14 
10.19 
3.06 
.95 
.14 
1.33 
2.03 
trace 
.21 
.02 
.04 
trace 
trace 
.27 
trace ? 
trace 
trace 
43.11 
11.10. 
4.97 
13.04 
9.35 
11.76 
1.18 
" 1.27 
.16 
1.92 
1.32 
62. 91 
23.37 
51. 25 
16.53 
1.81 
7.67 
5.87 
9.32 
3.35 
.78 
.19 
1.26 
1.84 
44.09 
10.68 
2.72 
12.96 
10.75 
11.58 
1.19 
.88 
.21 
1.91 
1.73 
60.90 
ALA 
Fe,0, 
24.97 
FeO 
MeO 
CaO 
5.83 
7.78 
.20 
| .42 
7.85 
Na 2 
6.26 
K 2 
.16 
H 2 at 105° . . . 
H 2 above 105° 
Ti0 2 
1 .48 
co 2 
P 9 0« 
.10 
.31 
(?) 
undet. 
trace 
trace 
.28 
(?) 
(?) 
trace? 
.10 
s 
V.,0, 
.07 
trace 
trace 
.43 
none 
none 
(?) 
nndet. 
trace 
trace 
.32 
none 
none 
(?) 
Cr.,0, 
NiO 
MnO 
SrO 
BaO 
(?) 
(?) 
(?) 
(?) 
(?) 
Li 2 
(?) 
Specific gravity 
100. 14 
99.78 
3. 220, 21. 5° 
100. 51 
2. 667, 24° 
100. 46 
99.12 
3. 217, 29° 
100. 62 
2. 677, 22° 
