IGNEOUS AND CRYSTALLINE ROCKS. 127 
2. 37 3.13 5.24 64 
4, 44 -50 2.24 32 
1.95 1.24 1.00 1.57 
3.39 . 89 59 3.56 
1.24 1.04 2. 41 23 
3.13 58] mone 28 
72 56 32 trace 
07 23 .12 none 
3. MORENCI DISTRICT. 
Rocks collected by Waldemar Lindgren and described in P. P. 43, p. 168. Analyses 
by W. F. Hillebrand, record No. 1997. 
A. Fresh porphyry, Ryerson mine. 100-foot level. Lassenose. 
B. Altered porphyry, same locality as A. 
C. Altered porphyry, chalcocite zone, Humboldt stopes. 
D. Surface alteration of altered porphyry, Copper Mountain. 
E. Primary silification of porphyry, Ryerson mine. 
4. MISCELLANEOUS ROCKS. 
A, B, C, D. Mica basalt, Santa Maria Basin. See Iddings, Bull. Phil. Soc. Wash- 
ington, vol. 12, p. 212. Not‘fully described. Analyses by W. F. Hillebrand, record 
No. 1261. 
A. Auvergnose. 
B, C, D. Monzonose. 
E. Hornblende porphyrite, Sierra Carrizo. Dacose. Described by Cross, 14th 
Ann., p. 165. Contains plagioclase and hornblende, in a groundmass of quartz and 
orthoclase. Analysis by Hillebrand, No. 1429. 
