950 
MANGANESE DEPOSITS OF INDIA: DESCRIPTIVE. [PaeT IV . 
it 
As the speckled variety of ore is found at several deposits, a piece of 
was sent to Messrs. J. and H. S. Pattinson and Co. of Newcastle 
for analysis. The result is shown below : — 
Manganese peroxide 
Manganese protoxide 
Ferric oxide 
Alumina . 
Baryta 
Lime 
Magnesia . 
Potash 
Soda 
Combined silica 
Free silica 
Sulphur 
Phosphoric oxide 
Arsenic oxide 
Cobaltous oxide 
Nickelous oxide 
Cupric oxide 
Lead oxide 
Zinc oxide 
Titanic oxide 
Chlorine and fluorine 
Combined water 
Moisture at lOO'C. 
Carbonic oxide . 
Specimen No. 1155 
4(i-2.3 
10-83 
31-64 
2-35 
0-13 
0-25 
0-24 
0-05 
0-06 
0-30 
0-05 
0-025 
0-076 
0-001 
0-05 
Nil 
Trace 
Nil. 
0-05 
0 • 13 
Nil. 
1 -00 
0-55 
Nil. 
100-012 
Manganese . . . . . . . . .42-27 
Iron 22-15 
Silica (total) 0-35 
Phosphorus 01)-33 ' 
It is evident, both from the fact that the ore contains only 0-30 per cent, 
of combined silica, and from the strongly magnetic character of the 
granules of hard bright mineral, that the latter cannot be braunite. They 
must be either mangan-magnetite or vredenburgite. 
From a comparison of this analysis with that of vredenburgite given 
on page 909, it will be seen that there is a striking resemblance between 
the two analyses, especially in the amounts of manganese and iron. As, 
however, the amount of the granular mineral in the ore cannot be more 
than about 50 to 60 per cent., it is evident that if it is to contain all the 
iron it cannot be vredenburgite, because it would also need all the 
manganese in the analysis. But a portion of the manganese must be in 
the matrix in the psilomelane and the sooty oxifles. The latter may of 
course also contain a portion of the iron. For the present, until some of 
this mineral can be isolated and separately analysed, it will be better to 
regard this mineral as mangan-magnetite. Owing to the presence of such 
a large amount of soft oxides that do not correspond to any definite 
