56 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
I. Feldspar, from gabbro, NW. } SE. } sec. 23, T. 62 N., R. 10 W. 
J. Feldspar, from gabbro, center of sec. 25, T. 64 N., R. 8 W. 
K. Feldspar, from gabbro, Duluth and Iron Range Railroad. 
Analyses I, J, and K by Hillebrand, record No. 1115. 
HH, I, J, and K analyzed for W. 8. Bayley. 
KAO. patna smanmie sede sical ania arcuaumaitmmedacniune 
TEGO 206 M00 e earcrssainere2 sel desis < Soe veeace teas 
H20 above 100°. es 
L. Garnetiferous gabbro, Granite Falls. Bandose. Described by W.S. Bayley in 
Bull. 150, p. 282. Contains plagioclase, augite, garnet, magnetite, a little hornblende, 
some quartz grains, and apatite. Analysis by H. N. Stokes, record No. 1296. Sp. 
gr., 3.105. P. R. C. 109. 
M. Gabbro-diorite, Minnesota Falls. Hessose. Described by Bayley in Bull. 
150, p. 369. Essentially plagioclase and hornblende, with some kaolin, augite, and 
biotite. Analysis by Stokes, No. 1296. Sp. gr., 2.935. P. R. C. 144. 
N. Quartz norite gneiss, Odessa. Described by Bayley in Bull. 150, p. 358. Con- 
tains quartz, plagioclase, pyroxene, biotite, garnet, magnetite, and sulphide of iron. 
Analysis by Stokes, No. 1296. Sp. gr., 2.770. P. R. C. 140. ¢ 
O. Mica schist, bed of Cross River, near Gunflint Lake. Description furnished by 
C. R. Van Hise. Contains biotite, quartz, feldspar (?), and pyrites. Analysis by 
T. M. Chatard, record No. 896. 
P. Actinolite-magnetite schist, SE. 4 SE. } sec. 34, T. 61 N., R.12 W. Described 
by Bayley in Am. Jour. Sci., 3d ser., vol. 46, p. 178. Mainly actinolite and magne- 
tite. Analysis by W. H. Melville, record No. 1403. 
Q. Magnetite rock near the preceding, also described with P by Bayley. Analysis 
by Melville, No. 1403. 
L M N. fo) P Q 
SO} Eee ee aE eet AT NOD AY Beene YR TT 52.31 | 48.29} 61.04] 64.77 | 12.35 1.16 
‘AlsOs 18.35 | 20.87] 16.97] 14.45 .10 1.81 
FeO 5.90] 1.13 |........ 1.84] 58.68] 69.08 
Feo 11.06} 4.93} 5.58] 4.54] 21.34] 27.10 
MgO 1,00] 7.54] 3.62] 2.34] 408 25 
CaO. 7.33 | 14.32] 5.99] 2.33] 1.91 53 
Nai Olathe aoadepecocmescmcriyer chin eo Bi oa ctes 2.90] 1.77] 1.96] 1.37]- trace |........ 
(JR RE RS NO ORC AMI LUA | 5 : : 5.03 : 
H20 at 105°... alae ae 
F20 above 105' 1.92 a 10 eteeeseree 
DO oo, siaisyedeeiace -60 12 none 
Fate icine "20 25 
Ok ccaiecs ar titencacarecaaceret si] 1.22 33 
BO gestern mscec nespsinacniimiansnabiamstac acts nomen pay eedl sek code -60 
COG cretaat ctoncer mentee ast ainanat tee haeormabanmnadana dl anc ccedltaneccetlcer cee Sal, Soden [ance 
FCB Se sie: ctceses ortaunctesersSrsteweecrnatecteyslonepsrbonenviure sent aaa Gdaiseadlececescd HHS tecaceceal hl. 
@ Probably pyrrhotite. 
