CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
67 
The following rocks, with one exception, are described by Clements 
in his portion of Mon. XXXVI: 
E. Mica-diorite, sec. 28, T. 42 N., R. 32 W., southeast of Crystal 
Falls. Contains plagioclase (andesine), orthoclase, quartz, biotite, 
hornblende, and titaniferous magnetite. Analysis by Stokes, record 
No. 1721. 
F. Hornblende-gabbro, sec. 29, T. 42 N., R. 31 W., west bank Michi- 
gamme River, east of Crystal'Falls. Contains labradorite, hornblende, 
and iron oxide, with subordinate pyroxene, biotite, and orthoclase. 
Analysis by George Steiger, record No. 1712. 
G. Bronzite-norite, same locality as F. Contains bronzite, horn- 
blende, and labradorite. Analysis by Steiger, record No. 1712. 
H. Wehrlite, sec. 29, T. 42 N., R. 31 W., on Michigamme River, 
east of Crystal Falls. Contains hornblende, pyroxene, olivine, biotite, 
and iron oxide. Analysis by Stokes, record No. 1721. 
I. Picrite-porphyry, sec. 27, T. 44 N., R. 32 W., northwest of Mans- 
field. Principal minerals serpentine, amphibole, chlorite, ilmenite, 
all but the last being secondary. Analysis by Stokes, record No. 
1721. 
Si0 2 
ALA 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H„Oat 110°. 
Ti0 2 . 
P 2 5 . 
Cr 2 3 . 
MnO. 
MO.. 
CO,.. 
58.51 
16.32 
2.11 
4.43 
3.73 
3.92 
3.11 
4.08 
.23 
2.00 
.72 
.30 
trace 
49.80 
19.96 
6.32 
.49 
7.05 
11.33 
2.22 
,61 
.13 
1.71 
.79 
.07 
L5 
99.46 
100. 63 
48.23 
18.26 
1.26 
6.10 
10.84 
9.39 
1.34 
.73 
.26 
2.00 
1.00 
.07 
. 43 
).91 
H. 
44.99 
5.91 
3.42 
8.30 
21. 02 
9.79 
.91 
.74 
.63 
3.19 
.97 
.05 
.25 
trace 
trace? 
99. 17 
37.36 
4.76 
6.61 
6.12 
31.11 
1.19 
trace 
trace 
.65 
10.37 
.79 
.06 
.62 
trace 
.04 
none 
99. 68 
Ba, Sr, CI, F, S, 60 3 not looked for. 
