348 



KRAMM— SERPENTINES OF THE CENTRAL 



[June 6, 



III. Serpentine from Oak Hill. Partial analysis by U. S. G. S. 



IV. Serpentine from Presidio, San Francisco. J. D. Easter, analyst. 



V. 



SiO= 39.64 



AI2O3 1.30 



F=03 



FeO 776 



MgO 3713 



CaO 



Na^O 



K2O 



H2O i3-8i 



MnO 12 



Cr^Oa 29 



TiO. 



NiO 33 



P2O. 



Total 100.38 



100.08 



99-99 



ior.o6 



V. Black impure serpentine from near Borax Lake, Lake Co. Mono- 

 graph XIII., U. S. G. S.. 1888, p. III. Analyst not stated. 



VI. Serpentine from Mayacmas Range. H. E. Kramm, analjst. 



VII. Serpentine from Mount Diablo. W. H. Melville, analyst. 



VIII. Serpentine weathered interwoven with quartz and calcite from 

 Mount Diablo. W. H. Melville, analyst. 



Table of Analyses. 



Serpe)itincs. 



IX 



SiO. 41.86 



AI2O.. 69 



Fe=03 



FeO 4.15 



MgO 38.63 



H,0 14.16 



MnO 20 



Cr=03 24 



NiO trace 



99.93 



X. 

 42.06 



2.72 



2.88 



39.53 

 12.04 



99.23 



IX. Pure serpentine from near Borax Lake, Lake County. Monograph 

 XIII., U. S. G. S., 1888. Analyst not stated. 



X. Serpentine from Angel Island. F. L. Ransome, analyst. 



