132 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
3. BULLFROG DISTRICT. 
Rocks collected and described by F. L. Ransome. Analyses by G. Steiger, record 
No. 2272. 
A. Porphyritic rhyolite, southeast slope of Bush Peak. Contains quartz, orthoclase, 
plagioclase, mica, magnetite, and apatite. 
B. Rhyolitic glass, west slope of Burton Peak, near summit. Contains pheno- 
crysts of plagioclase, hornblende, and mica. 
C. Dacite, east slope of Black Peak. Contains plagioclase, orthoclase, quartz, mica, 
and magnetite, in a glassy groundmass. 
D. Quartz basalt, knob east of summit of Black Peak. Contains plagioclase, quartz, 
orthoclase, olivine, pyroxene, biotite, and magnetite. Olivine serpentinized. 
E. Leucite basalt, road to Indian Springs, 14 miles north of Rhyolite. Contains 
olivine, leucite, augite, apatite, and possibly a little nepheline. 
13 65 39 2.37 4.10 
20 - 06 - 66 2.69 9.37 
58 1.90 2.01 6.55 11. 62 
2.96 3.30 3. 89 3. 28 2.96 
4.65 4, 22 5.3] 3.33 1.30 
HeO at 105°...... 1.03 81 1.89 12, 1.91 
H20 above 105° 96 3. 78 1.16 1.38 3.94 
iO2- 18 25 1.53 95 1.46 
ZO BisaesSscsctssix aia: zines shayayabshe ata tanies in ache ire bchetdhsaislels ace sisutsiaiateasxie' alll aelz zisielats OW, mis recnicena| ce raccns, 02 
COz.. none} none} none 1.12 63 
PyO pe senna et aneeeveen Gerad Herta e omens 2 trace - 08 22 40 
MDO jxaascoms weseecactantes ce oe pgenmenena ve tesa tera -03 -06 04 10 12 
Ba Qierteneus sy 14 ceeeeie none - 03 15 0: 16 
ST Ota rei a uate do cg Senn te Pecan asain’ none 03 03 | undet. 4 
4. MISCELLANEOUS ROCKS. 
A. Rhyolite, south-southeast of McClellan Peak, Washoe. Mihalose. Contains 
feldspars, orthoclase predominating over plagioclase, quartz, mica, and hornblende. 
B. Dacite, spur northeast of McClellan Peak. Toscanose. More plagioclase than 
orthoclase, much mica, less hornblende, little quartz. 
Rocks A and B are described by Hague and Iddings in Bull. 17. Analyses by 
F. A. Gooch, records Nos. 119, 129. FeO not separately determined. 
C. Basalt, summit of Richmond Mountain, Eureka. Hessose. Red, porous. Con- 
tains augite, less hypersthene, feldspars, and magnetite, in a glassy base, with accessory 
olivine and quartz. Analysis by J. E. Whitfield, record No. 424. 
D. Andesitic perlite, south of Carbon Ridge, Eureka. Amiatose. Contains plagio- 
clase, hornblende, biotite, quartz, hypersthene, augite, magnetite, apatite, and zircon, 
with a glassy base. Analysis by W. H. Melville, record No. 1240. 
Rocks C and D are described by Hague and Iddings in Mon. XX. 
E. Dacite, west side of Silver Peak range, south of Emigrant Road. Lassenose- 
toscanose. Contains phenocrysts of plagioclase, sanidine, possibly quartz, aaa 
hornblende, augite, magnetite, and apatite. 
F. Spherulitic rhyolite, southeast of Red Mountain, Silver Peak range. Toscanose. 
Contains sanidine, quartz, biotite, titanite, magnetite, and zircon, in a spherulitic 
groundmass. Pa 
Analyses E and F by George Steiger, record No. 1887. Rocks E, F, collected by 
H.W. Turner. Described in P. P. 55. 
