CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
247 
14. MOUNT DIABLO. 
Described by Turner and Melville in Bull. Geol. Soc. Amer., vol. 2, 
pp. 383-414. 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. Auvergnose. Composed of augite, 
plagioclase, and ilmenite, with uralite and chlorite secondary. 
B. The same rock, partly altered and partly uralitic. Ornose. Called 
"diabase-diorite" by Turner. 
C. Pyroxenite, near Bagley Creek. Cecilose. Composed of bronz- 
ite 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. 1247. 
A. 
B. 
c. 
D. 
Si0 2 
52.06 
14. 34 
2.11 
7.74 
9.26 
8.05 
1.74 
.73 
.59 
2.90 
.47 
.13 
51.58 
14.99 
2.04 
8.36 
6.51 
59 
..08 
.31 
.34 
2.67 
1.05 
.24 
53.25 
2.80 
.69 
5.93 
19.91 
16.22 
.19 
trace 
.05 
.24 
47.84 
A1 2 0, 
16.88 
Fe 2 H 
4.99 
FeO •_ 
5. 56 
MgO 
7.89 
CaO 
11.15 
Na 2 
3.20 
K 2 
.46 
H 2 at 105° 
.17 
H 2 above 105° 
1.81 
Ti0 2 
P.,0 5 
.54 
.07 
.09 
.14 
Cr 2 3 
NiO 
MnO 
trace 
trace 
.56 
100. 12 
99. 76 
99.98 
100. 65 
