CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
81 
6. MISCELLANEOUS ROCKS FROM MINNESOTA. 
A. Granulitic hypersthene-gabbro, from SE. \ sec-20, T. 65 X., R. 
4 W. Described by Bayley, Journal of Geology, vol. 3, p. 1. Con- 
tains hypersthene, biotite, diallage, magnetite, and plagioclase. Poor 
in feldspar. Analysis by H. N. Stokes, record No. L267. 
B. HyDersthene from A. Analysis by E. A. Schneider, record No. 
1358. 
C. Granulitic diallage-gabbro, SE. i of NW. \ of sec. 26, T. 64 N., 
R. 8 W. Described by Bayley, Journal of Geology, vol. 3, p. 1. 
Contains diallage, hypersthene, magnetite, and plagioclase. Analysis 
by W. H. Melville, "record No. 1403. 
D. Olivine-gabbro, west side of Birch Lake, SE. \ of sec. 19, T. 63 
N., R. 1 W. Described by Bayley, Journal of Geology, vol. 1, p. 688. 
Contains a large proportion of diallage and olivine. Analysis by 
Stokes, No. 1267. 
E. Olivine from D. Analysis by W. F. Hillebrand, record No. 1308. 
A. 
B. 
c. 
D. 
E. 
SiO; 
46.96 
14.13 
.76 
14.95 
15.97 
2.32 
.35 
1.68 
.07 
1.26 
.62 
- .03 
trace 
.93 
48.44 
7.91 
.33 
20.88 
19. 35 
1.44 
49.56 
17.81 
2.76 
9.48 
5.93 
9.70 
2.87 
45.66 
16.44 
.66 
13.90 
11.57 
7.23 
2. 13 
.41 
.07 
.83 
.92 
.05 
trace 
trace 
} 
35.58 
.92 
33.91 
26.86 
.90 
A1A 
Fe 9 Oo 
FeO 
MgO 
CaO 
> T a 2 
K 2 
H 2 OaM05° 
.08 
none 
undet. 
| .50 
.48 
.67 
.11 
.20 
1 . 22 
H 2 above 105° 
Ti0 2 
P.,0, 
Cr 9 0, 
} 
trace 
.35 
.20 
MnO 
.92 
.06 
CoO.. 
NiO 
.06 
.16 
co 2 
trace 
100. 09 
99.35 
99.82 
100. 03 
100. 25 
Bull. 168- 
