IGNEOUS AND CRYSTALLINE ROCKS. 161 
100. 45 | 100.25 | 100.62 | 99.92) 100.13 
J. Light-green marmolitic serpentine, New Idria. P.R. C. 1468. 
K. Black serpentine, Sulphur Bank. P. R. C. 1469. 
L. Light-green serpentine, Sulphur Bank. P. R. (. 1470. 
14, MOUNT DIABLO. 
Described by Turner and Melville in Bull. Geol. Soc. America, vol. 2, pp. 383-414. 
Analyses by W. H. Melville. Those with record numbers were made in the Washing- 
ton 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 bronzite and diallage. 
Equivalent to the websterite of North Carolina. P. R. C. 735. 
D. Glaucophane schist, Pine Canyon. Contains rumerous cinnamon garnets. 
A, B, and C have the record No. 1247. 
