148 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
A. Granulite (aplite), Yuba Gap, road east of Sierra Buttes. Toscanose. Contains 
orthoclase, microcline, quartz, plagioclase, some shreds of greenish mica, and a little 
iron ore, chlorite, and apatite. P. R. C. 730. . 
B. Granulite (aplite), dike east of Milton. Toscanose. Contains orthoclase, quartz, 
plagioclase, a little microcline, brown mica, and iron ore. P. R. C. 734. 
(. Biotite-quartz monzonite, Indian Valley. Lassenose. Contains plagioclase, 
orthoclase, quartz, brown mica, apatite, and iron ore. P. R. C. 737. 
D. Quartz diorite porphyry, dike in Indian Valley granite. Yellowstonose. Con- 
tains plagioclase, hornblende, biotite, and quartz. P. R. C. 738. 
E. Quartz-mica diorite, large area east of Milton. Harzose. Contains plagioclase, 
a turbid feldspar which is apparently not orthoclase, quartz, green hornblende, brown 
mica, iron ore, and apatite. P.R. C. 732. 
14 24 03 20 
24 62 41 95 
trace 15 18 30 
trace - 08 07 18 
03 ON lecesines 06 
14 09 12 10 
100. 4 99. 09 | 99.99 | 100. 23 
F. Diabase porphyry, dike east of Milton. Camptonose. Contains labradorite and 
other plagioclase, augite, and hornblende, the last mineral being perhaps secondary, 
P.R. C. 733. 
G. Hypersthene andesite, point northeast of Goodyears Bar. Yellowstonose. Con- 
tains plagioclase and rhombic pyroxene, a little augite, and scales which seem to 
represent former biotite, now replaced by magnetite. P. R. G. 731. 
H. Hornblende-pyroxene andesite, dike southeast of Poker Flat. Tonalose. Con- 
tains plagioclase, augite, hornblende, magnetite, some glass, and occasional quartz. 
P.R. C. 736. 
I. Quartz-bearing andesite, northwest of Downieville. Tonalose. Contains 
plagioclase, augite, enstatite, magnetite, occasional quartz, and probably glass. 
P. R. C. 753. 
F G. H I. 
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K20........ 1.63 1.65 1.94 1.59 
H20 at 100°... 17 285 64 24 
H20 above 100° 1.16 22 74 45 
TO Ss sciscaten cinies 60 30 82 42 
P20. - 21 12 25 17 
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gO 2a ABP NR EE as Paziacar micmaas SwaAtatmennes Hee eR ina eeacd trace | trace | trace none 
Osh cosists cccciw ee taartiea a Renee se xnmuiness tab cammmmns ce Reread Heke lees mu lees alaaas ame 
99.92 | 100.23 | 100. 37 99. 96 
