918 
MANGANESE DEPOSITS OF INDIA: DESCEIPTIVE. [PaRT IV: 
Silica (free) . 
Phosphoric oxide 
Arsenic oxide 
Ci)inl)iiied water 
Moisture at 100°C. 
Carbon dioxide 
Specific gravity 
This is equivalent to : — 
Manganese 
Iron 
Silica 
Phosphorus 
Moisture 
001 
0-08 
0-005 
0-78 
007 
00) 
100165 
56-12 
615 
6-84 
0-035 
007 
In terms of mineralogical composition the analysis can be re-written 
&s follows : — 
0-18 
Cakite . 
0-11 
BfAunite (including 
8-78% Fe203)' '. 
08-54 
Psilomelane — 
AU(Mn05)3 . 
. 008 
Ba2Mn05 
1-12 
Ca2Mn05 
1 -32 
Mg2Mn05 
. 1-32 
H4Mn05 
. 301 
Mn2Mn05 
. 24-63 
31-48 
31-48 
0 005 
007 
Subtract oxygen assumed 
100-395 
0-23 
100165 
The duplicate half of the specimen analysed does not seem to contain 
such a large proportion of psilomelane. Judging by the eye it contains 
at least 80 per cent, of coarsely crystallized braunite in plates, varying 
from J to 1 inch, but usually about \ inch across. This may indicate 
that the braunite does not correspond to the formula 3Mn203.MnSi03, 
as was assumed in making the foregoing calculation, but to one of the 
other formulae 7Mn203.2MnSi03 or 4Mn203.MnSi03 (see page 70). 
At the time of my first visit (February 1904) there were some 9,000 tons 
of ore stacked. A sample of some 300 lbs. of ore was collected by pacing 
over the stacks and picking up pieces of ore at regular intervals. The sam- 
ple thus collected was found to consist largely of the second variety 
of ore noticed above, with a fair proportion of the coarsely crystalline 
