830 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVEJ [ PaRT tV ; 
tic rock. This rock may be called manganese-latente and consists of an 
aggregation of small concretions of wad. This breaks with a dull frac- 
ture, and is of a marked blue-black colour. Tt does not readily soil the 
fingers, but can be scratched easily with production of a brownish-black 
streak. There are also some limonite concretions in the same rock, 
showing radiate limonite externally, and massive chert-like limonite in- 
ternally. These limonite concretions are made up to 3 or 4 inches diameter. 
Only a small proportion of the 8-foot thickness mentioned by Mr. Bose 
consisted of ore, and as the total visible area at the surface of this 
manganese-late rite was 108 square feet, it is difficult to see how a few 
iiundred tons of ore could be' obtained. A sample of ore taken from 
this pit was analysed at the Imperial Institute with the following 
result : — 
Sample No. 67. 
MnO., 48-62 
MnOj 4-86 
Fo„0, 3-53 
SiO., (combiacd) 2-35 
SiOo(free) 2-44 
P,05 0-06 
Moisture at 100*^ C 0-39 
This is equivalent to : — 
Manganese . . . . . . . . 34-53 
Iron 2-47 
Silica . 4-79 
Phosphorus ........ 0-03 
It will be noticed that the constituents estimated total up to (52 % 
onlv. Doubtless combined water accounts for an important proportion of 
the remainder ; but even allowing for this there is probably a consider- 
able balance. This may perhaps be made up by baryta, but the possi- 
bility of considerable amounts of oxides of copper, cobalt, nickel, lead, 
and zinc should be borne in mind, and it is evident that this mineral is 
well worth careful analytical examination. 
24. Muret (Muraith). 
See Bose, page 87. 
25. Naigain. 
See Bose, page 85. 
