I CLARK K.} 
IGNEOUS AND CRYSTALLINE KOCKS. 
207 
M. Biotite-rhyolite, south end of Pine Nut Range. Lassenose. 
Described by Spurr, Journ. GeoL, vol. 9, p. 599. Analysis by Stokes, 
record No. 1882. Contains quartz, orthoclase, and striated feldspars, 
in a microcrystalline groundmass. 
N. Siliceous granite, south end of Pine Nut Range. Liparose- 
toscanose. Description by Spurr and analysis by Stokes as under M. 
Contains quartz, orthoclase, microcline, anorthoclase, albite, biotite, 
hornblende, and titanite. 
O. Tordrillite, Cactus Corral, Ralston Desert. AlasJcose-liparose. 
Analysis by Steiger, record No. 1883. Consists mainly of quartz and 
orthoclase. 
P. Tordrillite, Tybo, Hot Creek Range. SB. J/, of ' alaskase. Anal- 
ysis by Steiger, No. 1883. Contains orthoclase and quartz, with sec- 
ondary sericite. 
Q. Siliceous rhyolite, west side of Quinn Canyon Range. Toscanose. 
Described by Spurr, Journ. GeoL, vol. 9, p. 602. Analysis by Steiger, 
No. 1883. 
R. Biotite-granite, west side of Quinn Canyon Range. Toxcaxos* . 
Description by Spurr and anatysis by Steiger as under Q. Contains 
essential quartz and orthoclase, with accessory hornblende, titanite, 
magnetite, and a little striated feldspar. 
SiO,.. 
A1 2 3 - 
Fe 2 3 
FeO.. 
MgO . 
CaO . . 
Na 2 0. 
K,0.. 
H 2 above 105° 
Ti0 2 
C0 2 
PA 
Cl 
s ... 
MnO 
SrO. 
BaO. 
M. 
71.49 
15. 06 
1.51 
.88 
. 35 
1.54 
4. 19 
3.39 
.16 
.88 
.20 
none 
.08 
trace 
trace 
undet. 
99. 73 
N. 
75.09 
13.51 
1.13 
.08 
.18 
.91 
3.58 
4.71 
.17 
.25 
.22 
none 
.04 
trace 
trace 
undet. 
99. 87 
75.70 
13. 33 
.40 
.06 
.06 
.55 
3.19 
5.39 
.31 
1.17 
.02 
none 
.07 
.05 
trace 
undet. 
.04 
100.34 
Q. 
77.84 
13.20 
.80 
.25 
.11 
.20 
4. 06 
1. 55 
.37 
1.21 
none 
none 
.04 
trace 
.10 
none 
none 
none 
99. 73 
74.67 
13. 25 
1.06 
.18 
trace 
1.26 
3.99 
t. 62 
.18 
.22 
.07 
.71) 
.06 
trace 
none 
none 
none 
100. 35 
R. 
71.48 
13.00 
1.25 
1.55 
.95 
2.60 
2.60 
4.24 
.20 
1.24 
.43 
.30 
.09 
none 
.09 
undet. 
.09 
loo. 11 
