>r WGANF.SF DFPOSTTS OF TNPTA : OFSCRTrTTVP.. [P ART TV 
aiul indicates an average composition for the Kodegsion ores of 39% 
braunite and psilomelane.^ 
A picked specimen df Kodegtion ore, consisting of the liard fine-grained 
mixture of braunite and psilomelane, was analysed by myself with the 
following result^ : — 
Manganese peroxide . . . . . . . . , 5() ' 72 
Mansranese protoxide ....... . . 30 'S.''. 
Ferric oxidi' and aliuiiina ........ 3 '94 
Cobalt and nickel oxides (CoO + NiO) . . . . . . 0'48 
Raryta J-JO 
Magnesia ........... trace 
Silica G-80 
Phosphoric oxide .......... 0'22 
Water (combined) ......... 0'49 
Moisture at 100°C Q-OS 
100 -(13 
This is equivalent to : — 
Manganese ........... ,59 '73 
Phosi)horns . . . . . . . . . . . O'lO 
The silica was not separated into combined and free, but as it was left as a 
gelatinous residue on dissolving the ore in HCl, it may be supposed that it 
was largely present in combination as braunite. On this assumption the 
ore must have been composed of 68% braunite and 32% psilomelane, or 
roughly 2 of braunite to 1 of psilomelane. 
For the analyses given below I am indebted to the Indian Manganese 
Company : — 
Analyses of Kodegdon ores. 
Mine 1. 
Mine 2. 
Taken from a 
report made by 
Mr. H. Kilburn 
Scott for the 
promoters of the 
Indian Mangan- 
ese Company. 
All dried at 
212°F. 
1 
2 
3 
4 
5 
iSianganese . 
Iron . . 
Silica 
Phosphorus 
52-83 
6'-19 
4-53 
0-151 
51 -62 
8-52 
4-90 
0-083 
42-60 
14-84 
7-57 
0-080 
.52-68 
6 18 
9 ■;-)8 
0-092 
49-40 
9-22 
11-13 
0-132 
1 This sample was subsequently found to contain the following additional 
constituents : — 
NiO, C03O4, CuO 0-04 
K2O 0-82 
Ka20 . 0 29 
2 Rec. G. S. I., XXXi, p. 47, (190/), 
