CiiAP. XXXVI.] 
NAGPUE : LOHDONGEI. 
919 
braunite (the first variety). A complete analysis of this sample made at 
the Imperial Institute showed the following result A — 
Sample No. 28. 
Manganese peroxide . . . . , .49-70 
Manganese protoxide . . .... 2.'? .'')!t 
Feme oxide 10-2!) 
Alumina ......... 270 
Baryta 0 85 
Lime .......... 5 CO 
Magnesia ......... 1'64 
Silica (combined) ........ 3'5.') 
Silica (free) 0-86 
Phosphoric oxide ........ 016 
Arsenic oxide . . . . . . . . 0'015 
Combined water ........ 0 7.') 
Moisture at 100°C 0 30 
Carbon dioxide ........ 0'17 
100 17.-) 
This is equivalent to 
Manganese 
Iron 
Silica 
Phosphorus 
Moisture 
49-73 
7 20 
4 41 
0 07 
0-30 
The surprising feature of this analysis is the low percentage of com- 
bined silica, indicating as it does only 35 per cent, braunite. The 
manganese percentage is also lower than might have been expected ; 
this is due no doubt to the large proportion of psilomelane, in which the 
base portion of the manganate contains a larger proportion of calcium and 
magnesium than usual. 
As typical of the ore despatched from this mine, Mr. W. H. Clark 
has kindly provided the analytical figures given below. The complete 
analysis was made on a proportional mixture of the 7 samples, the rang'j 
of analysis of which is given after the complete analysis ; the total ton- 
nage represented is 2,246. This and the other analyses given below, 
were all made by Mr. R. D. Connell, Chemist to the Central Provinces 
Prospecting Syndicate. 
Manganese peroxide 
Manganese protoxide 
Ferric oxide 
Alumina . 
Baryta 
Lime 
Magnesia . 
4(i-49 
25-35 
12-81 
1- 86 
0-92 
2- 22 
0-75 
1 The following additional constituents have since been deteriuined :- 
NiO, C03O4, CuO 0 02 
K2O 019 
Na20 013 
