IGNEOUS AND CRYSTALLINE ROCKS. 145 
> 
wo 
fo) 
g 
es 
i) 
x 
jo) 
bg 
a 
cy 
x 
ied 
i] 
a 
~I 
i) 
x 
sn 
a 
a 
wo 
oo 
mo 
RASERRSE 
2 
HO at 100° 52.0252 yoeweeensacewesressas ex 
H20 above 100°... . 
oe COIN RAT 
99.94 | 99.96 | 100.17 | 100.18 | 100. 03 
F. Rhyolite, 34 miles southwest of Grizzly Peak. Toscanose. Description fur- 
nished by Turner. Contains sanidine, with less quartz and biotite, in a glassy ground- 
mass. Analysis by Hillebrand, record No. 1461. P. R. C. 776. 
G. Hornblende andesite, 4 miles from Pilot Peak. Tonalose. Described by Tur- 
ner in 14th Ann., p. 441. Contains plagioclase and hornblende in a groundmass carry- 
ing grains of magnetite. Analysis by Hillebrand, record No. 1432. P. R. C. 716. 
H. Hornblende-pyroxene andesite, southwest base of Mount Ingalls. Tonalose. 
Description supplied by Turner. Contains plagioclase, rhombic pyroxene, augite, 
brown hornblende, and magnetite, with much glass in the groundmass. Analysis by 
Hillebrand, record No. 1456. P. R. C. 728. 
I. Hypersthene andesite, Franklin Hill. Hessose. Description supplied by Tur- 
ner. Contains plagioclase, rhombic pyroxene, augite, and magnetite. Probably no 
glass. Analysis by Hillebrand, record No. 1548. P.R. C. 754. 
F G i. | I 
D1OD. seals tedsissiews sieesee sense 56. 88 
Al2O3 18. 25 
Fe203 2. 35 
FCO saan vayaceriee sai Pee tape yee 4. 45 
Ok. serait ere xrciasarsin tet 4.07 
CAO 8, cis itis cicetnrs ar ieeenereteons 7.53 
IN G20) ccspdarodadeuaonuderece 2b es 
KO sede Seen eieene omnes t be é 
HaO at 100°. ool. 142) 1 114), 124 
HO above 100°........-....... - é < 50 
TOs). cone saanicta eines if 45 
Hs are eiareise pace emai 24 eetaseeees < a 
INO sie cia tiricinicicinas Buea RE 
DEO! 35 dieisjecesqaversicusias sled eee 04 
Ba Oso eis nscensonte ketenes il 
TAO sieindewn ra diadabad Doncualereres Consort sesewucen ie caebooains tod wae trace 
100. 06 
