810 MANGANESE DEPOSITS IN INDIA : DESCRIPTIVE. [ PaRT IV 
As to the source of the manganese that converts apparently non-man- 
ganiferous micaceous hematite into mangani- 
Source of the man- fgi-Q^g hematite at the outcrops in certain 
ganese. _ ^ . . 
localities— for this manganiferous hematite is not 
to be found in every place where hematite occurs — Mr. Bose says ^ : — 
' There can be hardly any doubt that the original source of the manganese ores 
of the Jabalpur ground is to be sought for in the micaceous, — iron-banded quartz- 
ites of the Lora group. The hematite usually assumes the form of micaceous ii'on 
ore, and has manganese disseminated in it, though in very minute quantities.' 
This latter appears to be an assumption based on probability ; for 
no analytical or other evidence is given in support of the statement. 
That this assumption is probably correct, however, is indicated by the 
two following partial analyses by Messrs. J. & H. S. Pattinson. Sample 
A. 7 is of apparently non-manganiferous hematite from hill 1520 at 
Mangela, in the manganese area, and sample A. 10 represents the soft 
red hematite of similar age worked by native iron smelters at Jauli, 
outside the manganese-area : — 
Locality. 
Mangela. 
Jauh. 
Number of sample. 
A. 7. 
A. 10. 
Ferric oxide 
Ferrous oxide 
Total silica. 
Combined water 
Moisture at 100° 
C. 
69-86 
nil 
20-40 
1-40 
0-35 
85-57 
nil 
5-80 
2-50 
0-30 
Iron ......... 
Manganese ........ 
Phosphorus ........ 
48-90 
1-70 
0-479 
59-90 . 
0-16 
0-043 
Assuming that we may take it as settled that the fresh micaceous 
hematite does contain manganese in minute 
Formation of the ores. ... 
quantities, then it seems that, when the outcrop 
of the hematite-quartzites is subjected to weathering, both iron 
and manganese go into solution, and that the solution, percolating 
through the cracked surface rock, deposits its manganese in a state of 
fine dissemination in the unaltered hematite. Some of the manganese 
also replaces the bands of quartzite, jasper, phyllite, and shaly slate, 
1 Bee. G.S.I., XXII, p. 222. 
