926 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [PaBT IV : 
This interpretation of the analysis indicates that the psilomelane pre- 
sent has the composition Mn2MnO.-,. 
A conipk'te analysis of the braunite crystals noticed on page 924 is 
given on page 68. It shows the presence of : — 
Specimen No. 1110. 
Manganese 
Iron 
Silica 
Phospliorus 
57 -8(1 
3-85 
8-W) 
0 035 
Some of the ore that was stacked looked as if it were of veiy good 
quality ; but most of the stacks would have been the better for reclean- 
ing. Hence the sample (No. 29) taken from these stacks cannot be 
regarded as representative of the ore as it would be when propej-ly cleaned. 
The pieces in the sample often contained ferruginous and siliceous matter, 
and were of both the varieties mentioned on page 925. The partial 
analysis by the Imperial Institute was as follows : — 
Sample No. 29. 
Manganese peroxide 
Manganese protoxide 
Feiiic oxide 
Silica (combined) 
.Silica (free) 
Phosphoric oxide 
Moisture 
This is equivalent to :— 
Manganese 
Iron 
Silica 
Phosphorus 
Moisture 
39-43 
35 M 
10-8ti 
5-70 
2-23 
018 
0-38 
52-58 
7-00 
7-93 
0-08 
0-38 
and indicates that the sample contained about 57% braunite and 40% 
of psilomelane. Such ore is, of course, easily marketable. 
Seven partial analyses by Messrs. J. and H. S. Pattinson, of various 
types of ore from this deposit, kindly supplied by Messieurs Jambon and 
Cie. and H. D. Coggan, show the following limits and mean : — 
Limits of 7 
analyses. 
Mean of 7 analy- 
ses . 
Manganese 
48-96 to 
57 -CO 
52 -81 
1 
Iron 
2 -42 to 
10-l(j 
() -55 
•Silica 
0 -43 to 
9 •()() 
7-57 
}• Dried at 21 2° F. 
Phosphorus 
0-049 to 
0 1 03 
0-009 
1 
Moisture 
0-22 to 
0-41 
0-28 
J 
