I9I4.] CONCEPTION AND TRINITY BAYS, NEWFOUNDLAND. 437 



a label which reads " Spathiger Diallogit " pasted on it, is probably 

 diallogit. It is however a very impure rhodochrosite. 



According to W. Holzberger (ii: 383) and C. Zerrenner (25: 

 ? — ) the ores from the Kaiser Franz mine near Elbingerode, in the 

 Harz, occur as pocket-shaped intercalations a meter or so thick in 

 the silicious shales of the Culm. The ore consists of psilomelane 

 in dense and botryoidal masses, some pyrolusite and coatings of 

 wad, with rhodonite, rhodochrosite and quartz present as acces- 

 sories. The ore formerly worked contained on an average 60 to 

 63 per cent, of manganese peroxide, sometimes rising to 67 per cent. 

 (2^: 250). Zerrenner considers these manganese ores as later 

 material separated out of the silicious shales, a theory which needs 

 further investigation. Though the above described deposit is not 

 the same as that from which the specimens analyzed above came 

 from, it is no doubt similar. 



The Elbingerode occurrence is similar to the deposits of SE. 

 Newfoundland in that they are both primary manganiferous sedi- 

 ments. They differ in that the manganiferous zone of the former 

 occurrence is considerably regionally metamorphosed while the New- 

 foundland sediments show very little change in this way. Accord- 

 ing to the above analyses, assuming that the imported specimens are 

 representative of the region concerned, the deposits are very dif- 

 ferent in as much as they consist mostly of rhodonite and manganif- 

 erous cherts while those of Newfoundland are carbonate-oxides and 

 oxide-carbonates of manganese. 



VI. CHEMISTRY OF THE MANGANESE DEPOSITS. 



The most striking feature of the accompanying analyses is the 

 high content of MnO which ranges from 19.42 per cent, in Analysis 

 J, to 49.25 per cent, in Analysis D, with an average content of 

 30.02 per cent and an average metallic manganese content of 24.64 

 per cent. 



The manganese is present for the most part as the carbonate, 

 MnCOg or rhodochrosite, which varies from 10.23 P^r cent, in the 

 red band (Anal. E) to 44.39 per cent, in the green band (Anal. A) 

 of the Manuels deposit. Rhodochrosite is not recognizable as such 

 because of the impalpable fineness of grain of the deposit. 



