IGNEOUS AND CRYSTALLINE ROCKS. 
213 
14. MOUNT DIABLO. 
Described by Turner and Melville in Bull. Geol. Soc. Amer. , vol. 2, 
pp. 383-411. Analyses by W. H. Melville. Those with record num- 
bers were made in the Washington laboratory; the others were made 
in the laboratory at San Francisco. 
A. Diabase, Mitchell Canyon. Composed of augite, plagioclase, and 
ilmenite, with uralite and chlorite secondary. 
B. The same rock, partly altered and partly uralitic. Called u dia- 
base-diorite " by Turner. 
C. Pyroxenite, near Bagley Creek. Composed of bronzite and 
diallage. Equivalent to the websterite of North Carolina. P. R. 
C, 735. 
D. Glaucophane-schist, Pine Canyon. Contains numerous cinna- 
mon garnets. 
A, B, and C have the record No. 1217. 
Si0 2 ... 
A1A 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 at 105° 
H 2 above 105°. 
Ti0 2 
PA 
Cr 2 3 
NiO 
MnO 
52. 06 
14.34 
2.11 
7.74 
9.26 
8.05 
1.74 
.73 
.59 
2.90 
.47 
.13 
trace 
100. 12 
51.58 
14.99 
2.04 
8.36 
6.51 
8.59 
3.08 
.31 
.34 
2.67 
1.05 
.24 
trace 
99.76 
c. 
53.25 
2.80 
.69 
5.93 
19.91 
16.22 
.19 
trace 
.05 
.24 
.54 
.07 
.09 
99. 98 
47.84 
16.88 
4.99 
5.56 
7.89 
11.15 
3.20 
.46 
.17 
1.81 
1 I 
56 
100. 65 
