COMPOSITION OF OCEANIC ANTD LITTORAL MANGANESE NODULES. 



473 



Table IV. — Oceanic Nodules. (Summary of Results.) 



Number of 

 Sample. 



Insoluble 

 Residue 

 per cent. 



*Per cent. 

 Si0 2 in 



Oxygen 

 per cent. 



MnO 

 per cent. 



CoA 

 per cent. 



Ni 2 3 

 per cent. 



Formula of 

 Peroxide. 



I. 



20-56 

 20-30 



(17-46) 

 85-45 



5-47 

 5-48 



23-71 * 

 23-76 



: 19 



1-23 



(MnO r945 ) 

 MnO r901 



II. 



16-95 

















17-01 

 16-96 



(14-75) 



86-75 



5-78 

 5-82 



26-94 



0-19 



1-46 



(MnO r954 ) 

 MnO r908 



III. 



16-83 





5-25 













1683 

 16-63 



(14-68) 

 87-26 



5-29 

 5-28 



23-91 



0-21 



1-00 



(MnO r9W ) 

 MnO r937 



IV. 



27-68 

















27-63 

 27-52 



(23-09) 

 83-47 



4-07 

 407 



18-69 



0-19 



0-75 



(MnO x . 951 ) 

 MnO r926 



V. 



19-95 

 20-03 



(16-86) 

 84-34 



4-25 



4-25 



19-30 

 19-41 



0-34 



0-47 



(MnO r974 ) 

 MnO r941 



In calculating the "Formula of Peroxide" the MnO equivalents of the Co 2 3 and 

 Ni 2 are taken in the lower ones, and only the MnO found is taken in calculating those 

 in brackets. 



Table V. — Littoral Nodules. (Summary of Results.) 



Number of 

 Sample. 



Insoluble 

 Residue 

 per cent. 



*Per cent. 

 Si0 2 in 



Oxygen 

 per cent. 



MnO 

 per cent. 



Co 2 3 

 per cent. 



NiO and 

 CuO. 



Formula of 

 Peroxide. 



M 



29-51 



(25-24) 



3-96 



31-36 





s s 







29-83 



8510 



3-96 



31-34 



02 



MnO rs82 



N 



27-78 

 28-10 



(25-55) 



84-28 



2-48 

 2-49 



27-90 

 27-91 



0-02 



;re pres( 

 -aces of 

 ubtful. 



MnO r394 



P 



32-13 



32-17 



(26-83) 

 83-44 



3-62 

 3-58 



28-56 

 28-52 



0-05 





MnO r658 



Q 



28-99 

 28-91 



(23-94) 



82-70 



3-36 

 334 



29-25 

 29-30 



0-03 



;es of cop 

 samples, 

 small as tc 



MnO r507 



K 







6-25 















6-33 







cided tra< 

 all the 

 were so 





R 



29-56 





6-21 

 3-39 



37-15 

 29-72 





MnO r75 





29-21 





3-37 



29-49 





A 



M*O vm 



The upper numbers, in brackets, refer to the original substance, the lower ones to the Insoluble Eesidue. 



