Table 4. Chemical and Instrumental Analyses of Manganese Incrustation 



The samples were obtained about 30 miles south of San Miguel Island, 

 33° 46' N and 120° 49' W, at a depth between 5,000 and 6,000 feet. 



Element 



Sample No. 1 (%) 



Sample No. 2 (%) 



Ca 



0.64 



0.67 



Mg 

 Cr 



1.10 

 0.010 



0.99 

 0.013 



Mn 



12.4 



12.5 



Fe 



16.42 



19.08 



Ni 



0.26 



0.24 



Cu 



0.05 



0.07 



Pb 



0.13 



0.22 



Zn 



0.07 



0.05 



Sr 



0.02 



0.03 



Co 



0.05 



0.05 



Bo 



0.05 



0.04 



Mo 



0.35 



0.42 



K 



0.56 



0.44 



Na 



1.03 



1.20 



Si 



10.1 



8.9 



Ti 



0.74 



0.78 



A! 



3.67 



2.61 



P 



0.38 



0.44 



S 



0.09 

 0.8 



0.14 

 1.1 



O 



46.0 



45.0 



Total 



95.0 



95.0 



1 / Calculated from percent water obtained by drying at 1 10 C. 



