8S8 
MANGANESE DEPOSITS OF INDIA : DESCHIPTIVE. [ParT IV ; 
mens collected at times almost thirty years apart from a deposit !{ miles 
long. This agreement probably indicates a great uniformity in the 
mineral character of the merchantable ore. What this character is, is 
shown below, where the analyses have been recalculated to mineral 
constitution : — 
Apatite . . . . , 
Calcite 
Braiinite ..... 
(containing 4-39 and 9 '87 Fe203 respec 
ively) 
Psilomelane : — 
Al4(.Mn()5)3 
Ba2Mn05 . 
OaaMnOs . 
i\Ig2Mn05 . 
H4Mn05 
Qiiai'tz 
AS2O5 
Moisture 
1-61 
1-99 
1-69 
0-30 
8-72 
29-64 
43-95 
Institute. 
Mallet. 
0-49 
0-14 
0-49 
50-08 
60-85 
1 -79 
10-15 
28-15 
43-95 
0-36 
0-017 
0-10 
40-09 
40-09 
101 - 137 
101-43 
0-38 
0-39 
100-737 
101-04 
Total . 
Subtract oxygen assumed . 
Total . 
Hence we can say that, roughly speaking, the manganese- ores of Mansar 
consist of about 60% braunite and 40% psilomelane. 
Mr. W. H. Clark has kindly furnished the following complete analysis 
made in January ]900 by Mr. H. H. Dains on a sample of 100 tons of 
' boulder-ore ' from the north side of the deposit. Although it was made 
on a comparatively small quantity of ore as long age as 1900, Mr. 
Clark tells me that it can be regarded as typical of the ore exported 
at the present day. 
Manganese peroxide 
-Manganese protoxid 
Ferric oxide 
Alumina 
Bar^'ta 
Lime 
Magnesia 
Silica 
Phosphoric oxide 
Arsenic oxide 
Sulphuric oxide 
Nickel oxide 
Copper oxide 
Zinc oxide 
Combined water 
Moistiu-e 
5 1- • 08 
2C-77 
6-88 
l-3t 
0-80 
Nil 
0 15 
6-94 
0-12 
NU 
Nil 
Nil 
Nil 
0- 18 
1- 92 
0-.35 
99-53 
Manganese = 54-93 
Iron =4-82 
Phosphorus = 0 - 05 
