32 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
Q. Amphibolite, South Leverett. Deep green, ligniform. Analysis 
by L. G. Eakins, record No. 1327. 
R. Amphibolite. Goshen. Derived from Conway limestone. Analy- 
sis by Eakins. record No. 1414. 
S. Black, fissile amphibolite, Worthington. Nearly pure, matted 
hornblende. Titanite and sometimes zircon present. Analysis by 
Eakins. record No. 1326. 
T. Black, fissile, porphyritic amphibolite. Warwick. Analysis bv 
Eakins, record No. 1114. Collected by Emerson, but not described in 
Monograph XXIX. 
Q. 
R. 
s- 
r- 
Si0 2 
47.56 
16.13 
1.80 
55.64 
16. 27 
1.22 
48. 53 
16.35 
2.03 
50. 65 
13. 03 
.27 
A1,0 3 
Fe 2 O s 
FeO 
9.39 
7. 20 
10. 52 
12.67 
MgO 
9.21 
5.58 
9.71 
16. 96 
CaO 
6.67 
9.23 
9.83 
1.73 
NasO 
2.52 
.91 
1.36 
1.37 
K 2 
1.58 
.19 
.32 
.04 
H 2 
3.51 
3.11 
.79 
2.96 
Ti0 2 ..... 
1.24 
.50 
.51 
. 50 
P,0=, 
.21 
trace 
.23 
.07 
trace 
trace 
Cr.,0, 
MnO 
.08 
.28 
.17 
.15 
BaO 
trace 
trace 
99.90 
100.36 
100. 19 
100.33 
