IGNEOUS AND CRYSTALLINE ROCKS. 137 
A. Granite porphyry, Bully Hill district. Contains quartz, orthoclase, plagioclase, 
iron ores, apatite, and sphene. Analysis by G. Steiger, record No. 2378. 
B, Altered granite porphyry, Bully Hill. Contains quartz, orthoclase, plagioclase, 
kaolin, and chlorite. Analysis by Chase Palmer, No. 2379. 
C. Granite porphyry, near Shasta King mine. Contains quartz, orthoclase, plagio- 
clase, iron ore, apatite, zircon, and sphene. Analysis by Steiger, No. 2378. 
D. Altered granite porphyry, near Shasta King mine. Contains quartz, orthoclase, 
plagioclase, chlorite, and epidote. Analysis by Palmer, No. 2379. 
E. Granite porphyry, Afterthought district. Contains quartz, orthoclase, plagio- 
clase, and iron ore. Analysis by Steiger, No. 2378. 
F. Granite porphyry, Little Backbone Mountain. Contains quartz, orthoclase, 
plagioclase, magnetite or ilmenite, apatite, and sphene. Analysis by R. C. Wells, 
No. 2380. 
99.85 
BaO, SrO, and SO; absent. 
G. Altered granite porphyry, between Mammoth and Summit mines. Contains 
quartz, orthoclase, plagioclase, chlorite, epidote, calcite, and sericite. Analysis by 
Wells, No. 2380. 
H. Altered granite porphyry, near Iron Mountain mine. Contains quartz, ortho- 
clase, plagioclase, chlorite, and epidote. Analysis by Palmer, No. 2379. 
I. Silicified granite porphyry, near Clipper mine. Contains quartz, feldspar, and 
sericite. Analysis by Palmer, No. 2379. : 
J. Monzonite, railroad cut near Spring Creek. Contains quartz, orthoclase, plagio- 
clase, hornblende, iron ore, and apatite. Analysis by Steiger, No. 2378. 
K. Inclusion in monzonite. Contains quartz, orthoclase, plagioclase, iron ore, 
chlorite, and epidote. Analysis by W. T. Schaller, No. 2377. 
SiO» 77.63 | 72.53) 76.47 | 71.48 62.77 
Al2O3 12.33 | 14.90} 13.90} 13.24 15. 04 
Fe203 1.57 18 94 4.60 
FeO 1.26 1.84 - 40 3. 30 1.92 
MgO 01 2. 56 1.74 1.42 2. 30 
CaO 41 23 -19 3.75 6.76 
Na2O. 3.88 63 4,76 3.84 2.60 
KO oe oiins sco 3.75 1.91 «65 44 . 08 
H20 at 105°... 29 +95 
EO above 105° 3.01 
IDA O ahs ara donz esse secrsssrcsarelatcreye tenets rvs, sie eaters oe ae aR a Sees it Bony ald he lal alepsnciziegfal| sidlgrasenciege | ateieeeesizs |) "AGE faietwisietciate 
COs. . +23 
P205 pinacbie wie 
