CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
243 
M. Quartz-mica-diorite, Chowchilla River. Tonalose. See 17th 
Ann., Part I, p. 691. Contains plagioelase, quartz, a little orthocla.se 
(?), brown mica, hornblende, rather abundant apatite, a little iron ore; 
one zircon-like crystal was noted. Analysis by W. F. Hillebrand, 
record No. 1161. P. K. C. 715. 
N. Quartz-mica-diorite, Yaqui Creek. Tonalose. For the Educa- 
tional Series of Rocks. Contains plagioelase, quartz, biotite, horn- 
blende, a little pyroxene, iron ore and apatite. Analysis by George 
Steiger, record No. 1613. P. R. C. 135. Described by Turner in 
Bull. 150, p. 339. 
O. Diabase, dike li miles northeast of Hornitos. Auvergnose. See 
17th Ann., Part I, p. 691. Contains plagioelase, partly labradorite, 
augite, brown hornblende, and iron ore. Analysis by Hillebrand, 
No. 1161. P. R. C. 750. 
P. Igneous rock, near Cathay Hill. Bossweinose. See 17th Ann., 
Part I, p. 691. Contains two minerals unidentiiied; neither is olivine. 
Analysis by Hillebrand, No. 1161. P. R. C. 719. 
M. 
N. 
0. 
p. 
Si0 2 
A1 2 3 
62.62 
17.51 
.49 
4.06 
2.84 
5.49 
3.49 
1.76 
.22 
.92 
.55 
.12 
58.09 
17.46 
1.12 
5.08 
4.06 
6.24 
2.94 
2.02 
.29 
1.45 
.95 
.17 
51.32 
15. 28 
.47 
8.59 
7.25 
11.58 
2.92 
.22 
.06 
.95 
1.23 
.25 
47.75 
10.56 
Fe 2 3 
.74 
FeO 
8.34 
MgO 
19.09 
CaO 
9.62 
Na 2 
1.32 
K 2 
.12 
H 2 at 110° 
.05 
H 2 above 110° 
2.06 
Ti0 2 
.37 
1 P 2 5 
.03 
Cr 2 3 
.24 
NiO 
.07 
MnO 
.05 
trace 
trace 
trace 
none 
.04 
.07 
none 
.21 
.05 
.02 
trace 
.11 
.16 
trace 
none 
trace 
.10 
SrO 
trace 
BaO 
none 
Li 2 
trace 
C0 2 
so 3 
CI 
F 
C 
100. 12 
100. 37 
100. 28 
100. 46 
