CLARK K.l 
IGNEOUS AND CRYSTALLINE ROCKS. 
95 
7. MISCELLANEOUS ROCKS FROM MINNESOTA. 
A. Granulitic hypersthene-gabbro, from SE. \ of sec, 20, T. 65 N., 
R. 4 W. Oookose. Described by Bayley, Journal of Geology, vol. 3, 
p. 1. Contains hypersthene, biotite, diallage, magnetite, and plagio- 
clase. Analysis by H. N. Stokes, record No. 1267. 
B. Hypersthene from A. Analysis by E. A. Schneider, record 
No. 1358. 
C. Granulitic diallage-gabbro, SE. J of NW. i of sec. 26, T. 64 N., 
R. 8 W. Auvergnose. Described by Bayley, Journal of Geology, 
vol. 3, p. 1. Contains diallage, hypersthene, magnetite, and plagio- 
clase. Analysis by W. H. Melville, record No. 1-103. 
D. Olivine-gabbro, west side of Birch Lake, SE. £ of sec. 19, T. 63 
N., R. 4 W. Auvergnose. Described by Bayley, Journal of Geology, 
vol. 1, p. 688. Contains a large proportion of diallage and olivine. 
Analysis b/y Stokes, No. 1267. 
E. Olivine from D. Analysis by W. F. Hillebrand, record No. 1308. 
SiCL 
FeA - 
FeO 
MgO 
CaO 
Na 2 
K 2 0.. 
H 2 Oatl05°.... 
H 2 above 105° 
Ti0 2 ... 
PA 
CrA 
MnO 
CoO 
MO 
CO, 
46.96 
14. 13 
.76 
14.95 
15.97 
2.32 
.35 
1.68 
.07 
1.26 
.62 
.03 
trace 
.93 
06 
100.09 
48.44 
7.91 
.33 
20.88 
19.35 
1.44 
.08 
none 
undet. 
92 
99. 35 
c. 
49.56 
17.81 
2.76 
9.48 
5.93 
9.70 
2.87 
oi i 
trace 
99.82 
45.66 
16.44 
.66 
13.90 
11.57 
7.23 
2.13 
.41 
.07 
.83 
.92 
.05 
trace 
trace 
L6 
E. 
35. 58 
.92 
33. 91 
26.86 
.90 
.11 
.20 
1.22 
trace 
.35 
.20 
100.03 100.25 
