CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
241 
F. Amphibole-biotite granite, Nevada Falls trail, Yosemite Valley. 
Toscanose. Contains alkali feldspar, plagioclase, quartz, amphibole, 
biotite, magnetite, and apatite. 
G. Biotite-granite, base of El Capitan, Yosemite Valley. Toscanose. 
Contains alkali feldspar, plagioclase, quartz, biotite, titanite, apatite, 
and iron oxides. 
H. Brown mica separated from G. 
Analyses F, G, and H by William Valentine, record Nos. 1732, 1733. 
Samples G and H are described by Turner in Amer. Journ. Sci., 1th 
series, vol. 7, p. 294. 
Si0 2 .. 
ALA- 
Fe 2 3 . 
FeO.. 
MgO . 
CaO.. 
Na 2 . 
K,0.. 
H 2 above 110° 
TiO, 
Zr0 2 . 
V 2 0, 
Cr 2 3 
MnO 
SrO . 
BaO. 
Li 2 0. 
co 2 . 
pi... 
F ... 
66.83 
15. 24 
2.73 
1.66 
1.63 
3.59 
3.10 
4.46 
none 
.56 
.54 
.18 
.04 
71.08 
15. 90 
.62 
1.31 
.54 
2.60 
3.54 
4.08 
none 
.30 
.22 
.10 
.08 
ii. 
35. 64 
18.62 
5. 54 
14.60 
9.72 
.90 
.38 
9.22 
.48 
2.54 
1.12 
.20 
.10 
.03 
.11 
trace 
trace 
.02 
.15 
.02 
.04 
trace 
trace 
.02 
100. 82 
100. 60 
7<> 
trace 
trace 
26 
100. 01 
.11 
99.90 
Bull. 228—04- 
10 
