892 
MANGANESE DEPOSITS OF INDIA: DESCRiri'IVE. [ParT IV: 
Hematite 
by mica-schist. In one place the quartzites on tlie south side of the ore- 
band are very hematitic to a thickness of 1 foot. The 
hematite, which has probably been introduced by the 
metasomatic replacement of the quartzite, sometimes forms half the rock, 
and has often crystallized in scales up to | inch thick. In two places 
between the main ore-band (T3C) and the footwall-rock, hematite was also 
seen, in one case as a ]-inch vein and in the other as a 6-inch layer of 
hematite-clay. This occurrence of hematite is very interesting, because 
iron-ores are very raiely associated with the manganese-ore deposits 
occurring in the Archaean schists and gneisses of India. 
The manganese-ore in these pits is very soft and wet ; moreover, on 
Nature and qiuUity account of the large amount of foreign matter, it re- 
of the ores. quires a lot of cleaning. From two stacks containing 
some 35 tons of ore, sample 19 was taken. It was analysed at the 
Imperial Institute, with the following result : — 
Sample. No. 19. 
Manganese peroxide 
Manganese protoxidf^ 
FeiTic oxide 
Silica (combined) 
Silica (free) 
Phosphoric oxide 
Moisture at 100° C'. 
This is equivalent to :- 
Manganese 
Iron 
Silica . 
Phosphorus 
Moisture 
Since the above analysis totals up to 98*72 it can be regarded as 
practically complete. It corresponds roughly to the following :- 
34 
31 
39 
•40 
7 
•24 
7 
91 
8 
80 
0 
40 
0 
60 
52 
27 
5 
07 
16 
77 
0 
17 
0 
60 
Braunite 
Hematite 
Quartz 
Mn02 
MnO 
P2O5 
Moisture 
Undetermined 
79-27 
7 24 
8 86 
0-!4 
221 
n 40 
0- 60 
1- 28 
4 63 
4 63 
Total 
100-00 
The ore in the stacks from which the above was taken could have been 
improved in quality by cleaning out the visible siliceous matter, though 
probably only by rejecting a rather large proportion of the ore. The ore 
itself is a finely crystalline aggregate consisting largely, as shown above 
of braunite with admixed siliceous matter. 
