CuAV. XXXV. 1 
JABALPUR DISTRICT. 
809 
The following analyses of samples taken by me show that this ore 
still contains a very large proportion of iron : — 
Locality. 
Dharampura. 
Sakri. 
Number of sample. 
A. 17. 
69 
Manganese peroxide (MnO.,) 
32-28 
24 12 
Manganosp protoxide (MnO) 
2-dO 
2-13 
Ferric <>xidc (FcoOs) . 
:^5-28 
37-39 
Baryta (HaO) . 
119 
Combined silica (SiO,,) 
415 
2-51 
Free silica (SiOo) 
15-5() 
7-22 
J'hosphoric oxide (PoO-) 
0-355 
0-05 
Arsenic oxide (AS0O5) 
0-008 
Combined water ( H.,0) 
2-60 
Moisture at luO' C. " . 
0-30 
0-14 
rhese are equivalent to — 
Manganese .... 
22-34 
16-91 
Iron . . . . , 
24-70 
26-17 
Silica ..... 
19-65 
9-73 
Phosphorus .... 
0-155 
0-02 
A. 17. — Analysed by J. and H. S. Pattinson. 
69. — Analysed at the Imperial Institute. 
An analysis by Mallet of a sample from Ghogra and Dhanwahi is 
given on page 825. It shows : — 
Manganese (trace of cobalt) ..... 12-26 
Iron ......... 46-43 
Silica (insoluble residue) . . . . . . 9-55 
Phosphorus ........ 0-12 
Asa final stage the whole rock may become converted into psilome- 
lane, often containing remains ot original hema- 
F-silomelane . . , 
tite jasper, shale, or talc ; then, 01 course, 
except for these remnants, the original rock structure has been entirely 
obliterated. As an example of such final concentration of the man- 
ganese as psilomelane may be mentioned an analysis of psilomelane 
from Gosalpur by Mr. Mallet, which yielded 83-20% available peroxide 
= 52-537oMn i, and of a sample (A. 18) of psilomelane collected by 
me at Dharampura (see page 834). 
1 Bee. G. 8. I., XVI, p. 118. 
