Chap. XXXV. ] hoshangabad : sontulai. 
803 
21'43 per cent, of manganese. Later, when at head-quarters, I made a 
complete analysis of another sample with the following result^ ; — 
Sample M. 4. 
MnOj , 2413 
MnO 1-91 
Fe^Oa -t- AI2O3 2-28 
BaO 0-67 
MgO . . . . . . . . . traco 
SiO,, 6918 
PoO. 0-03 
CoO 017 
NiO 0-38 
CuO 0-47 
H^O (combined) 0-88 
Moisture 0-53 
100-63 
This is equivalent to : — 
Manganese ....... 16-73 
Phosphorus ....... 0-014 
This ore is of course of no economic value, and I would not recom- 
mend anyone to spend any money on openmg up the occurrence I 
do not know what is the origin of the deposit ; I imagine that it 
is not a true bed, but is more probably the result of the surface 
replacement of some very siliceous rock. For a calculation of the 
foregoing analysis into terms of manganates, see page 112. The possibility 
of making this re-arrangement points to the mineral's being psilome- 
lane ; but from its physical characteristics, especially its softness, it had 
better be called wad. The presence of the quantities of oxides of 
cobalt, nickel, and copper, shown is consistent with the mineral being 
called wad, some wads being rich in these constituents. 
Jabalpur District. 
The manganese-ores of the country round Gosalpur and Sihora in 
„ this district have at one time or another 
History. 
aroused a great amount of interest, and they 
1 Eec. G. S. I., XXXI, p. 48. 
O 
