134 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
M. Biotite rhyolite, south end of Pine Nut Range. Lassenose. Described by Spurr, 
Jour. Geology, 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. Descrip- 
tion by Spurr and analysis by Stokes as under M. Contains quartz, orthoclase, micro- 
cline, anorthoclase, albite, biotite, hornblende, and titanite. 
O. Tordrillite, Cactus Corral, Ralston Desert. Alaskose-lparose. Analysis by 
Steiger, record No. 1883. Consists mainly of quartz and orthoclase. 
P. Tordrillite, Tybo, Hot Creek Range. SR. 4 of alaskase. Analysis by Steiger, 
No. 1883. Contains orthoclase and quartz, with secondary sericite. 
Q. Siliceous rhyolite, west side of Quinn Canyon Range. Toscanose. Described 
by Spurr, Jour. Geology, vol. 9, p. 602. Analysis by Steiger, No. 1883. 
R. Biotite granite, west side of Quinn Canyon Range. Toscanose. Description 
by Spurr and analysis by Steiger as underQ. Contains essential quartz and orthoclase, 
with accessory hornblende, titanite, magnetite, and a little striated feldspar. 
M N ce) P; Q. R 
SiOss assngucetieveaasiots ta ware etna wares eo anosadenin 71.49 | 75.09] 75.70 | 77.84) 74.67 71. 48 
JAN3 OG iw se creeieniciisese Ex seneedicamasnme an tet PSe ooeeeaes 15.06 | 13.51 | 13.33} 13.20 | 13.25 13.00 
BQO gic detitccew vs sisaecitanmenkaaeans same ReeeReS 1.51 1.13 - 40 5 1.06 1.25 
ROO sac vienysnequins 24 snot aac wuisinee Se ace - 08 - 06 +25 18 “1.55 
MgO... 35 18 06 -11 | trace +95 
CaO... 1.54 91 -55 - 20 1.26 2. 60 
Na2O. - 4.19 3. 58 3.19 4.06 3.99 2. 60 
K20..- 3.39 4.71 5.39 1.55 4.62 4,24 
H20 at 105°. 2 -16 -17 31 .37 18 20 
FgO a BOV OO eo sesccc aa gpasernsinitineiescinieisnlacais Labinis eeicineinislage - 88 = 25 1.17 1.21 22 1.24 
MPO sia cctenceapseeseia eyes aecls Sd Sista Gees toms igisi via Mel se sSiatentons - 20 22 -02 | none 07 43 
eereeidininta fi Sue 2 Se fea a dine alagalaninaqa aes iOuIeS Seslemicleialese none -79 - 30 
04 - 06 09 
€ACE: | 2 s:22c 202 |oceseene 
-10 | trace none 
none | none 
none | none | undet. 
none | none 09 
99.73 | 100.35 | 100.11 
8. Biotite-hornblende-quartz latite, Bullionville, near Pioche. Amiatose. Analy- 
sis by W. F. Hillebrand, record No. 1881. Contains abundant quartz, plagioclase, 
biotite, hornblende, and magnetite, in a glassy groundmass. 
T. Biotite rhyolite, Meadow Creek Canyon. Liparose-toscanose. Analysis by 
Hillebrand, No. 1881. Contains quartz, orthoclase, some microcline, and a little 
biotite, in a glassy groundmass. 
U. Tordrillite, Meadow Creek Canyon. Liparose. Analysis by Hillebrand, No. 
1881. Contains quartz, orthoclase, and plagioclase, with accessory biotite, in a glassy 
groundmass. : 
V. Tordrillite, Sweetwater. Toscanose-liparose. Analysis by George Steiger, 
record No. 1883. Contains orthoclase and a little anorthoclase, in a feldspathic 
groundmass. 
W. Quartz-muscovite rock, Southern Klondike mine. Near SR. 1 of riesenase. 
Analysis by Hillebrand, No. 2087. Consists mainly of quartz and muscovite. 
X. Another sample like W. SR. 1 of dargase. Same analyst, number, and descrip- 
tion. 
