438 



DALE— CAMBRIAN MANGANESE DEPOSITS OF [April 25, 



Solubility tests made of the red band (Anal. E) which has 

 27.61 per cent, of SiOo, in which HCl was used as the solvent, show 

 that the manganese must be present in some other combination than 

 in that of the silicate, as the residue was about sufficient to cover 

 the total silica, SiOo, ALOg and P2O5. In Anal. D, it is evident 

 that the two most important constituents are MnCOg and MnOs 

 with percentages of 32.89 and 28.93 respectively and that the excess 

 manganese calculated as the oxide is more than sufficient to form 

 an important manganese silicate as the mineral percentage of SiOo 

 is only 5.40, which fact lends support to the result of the solubility 

 test made with the red band, Anal. E. A similar interpretation 

 might be made with the Topsail ore (Anal. I) which is primarily an 

 oxide ore with MnOo — 34.25 and MnCO.; — 11.27. SiOo, of which 

 there is 10.32 per cent., probably is present in an uncombined state. 

 The comparative instability of MnCOg would, however, lead one to 

 suspect that the excess MnOo, where not of primary origin, was a 

 derivative of the carbonate and not combined with SiOo to form the 

 silicate, MnSiOg. 



Analyses of Manganese Deposits of Newfoundland and Elbingerode. 



Manuals: 



A, Green band 



B, Pink nod. . . 



C, Green nod. . 



D, Brown band 



E, Red band . . 



F, 219 A II . . . 

 G* 219 A 3 . . . 

 H, 219 A 13 . . . 



Topsail: 



I, 219 E4 



J, 219 E6 



K, Smith Pt. . . 



Elbingerode: 

 L, Elbin. (-) . 

 M.Elbin. (+) 

 N, Elbin. (=). 



7.24 



5-14 

 10.31 

 10.23 

 27.61 

 18.42 

 58.62 

 25.20 



18.04 

 18.24 

 15-14 



39.10 



76.40 



7.10 



3-36 

 1.40 



7-35 

 1.32 



4-25 

 6.33 



3-12 



10.13 

 4.82 



10.01 



9.22 



1.87 



.007 



.62 



6.II 

 1.64 

 3-68 

 4.14 

 6.96 



7-95 



22.42 



7.67 



6.58 

 14.52 

 12.04 



10.79 



2.46 



.76 



35-53 

 20.49 

 31-76 

 49-25 

 26.05 

 21.44 

 -43. 



41.26 

 19.42 

 25-63 



27.69 

 10.53 

 52.01 



6.43 



11.302.30 

 32.921 .01 



10.471I.80 

 8.11I3.02 



9-9413-49 

 i4.46|5.oi 



1.25 .26 

 23.50A.78 



2.24^2.395.40 



i3-74;4-94 

 io.04;3.72 



1. 00 6.08 

 1. 6211. 81 

 2.261.17 



4.71 

 3-46 



17- 



1.71 

 1.26 



1.65 



2.85 

 I-31 

 4-73 

 2.58 

 -54 

 2.71 



7.98 

 2.07 

 2.73 



I-13 



.80 



1.70 



28.06 

 36.77 

 25-31 

 21.83 

 10.57 

 21.20 



3-99 

 2.23 



8.34 

 24.01 

 21.05 



13-13 



7-32 



32.20 



100.09 



100 02 



99.96 



100.10 



100.00 



100.85 



94-29 



93-90 



97-05 



99.66 



100.83 



100.79 



100.94 



97.82 



* Analyst, Mr. A. F. Buddington. 



The evolution of CI during the digestion of the samples with 

 HCl is evidence that the excess Mn occurs as some peroxide. As 



