89-1 
MANGANESE DEroSITS OF INDIA : DESCJKli'Tl VE. [PaUT IV : 
Manganese . . . . . . . . 3i)'43 
Iron . . . . . . . . . . 20 '56 
Silk a ........ . 3-1)9 
Phosphorus ......... 0*06 
Moisture . . ... . . . . 0'15 
Specific gravitj' . . . . . . . . . 4 '18 
This analysis corresponds to one of the two following mineral composi- 
tions : — 
I II 
Apatite . . . . .0 35 . . . .0*35 
Calcite . . . .010 . . .016 
Braunite 25 05 
Hematite 29-37 . . . .29-37 
Psilonielans : — 
Al4(Mn05)3 0-yO 
Ba2Mn05 0-()0 
Ca2Mn05 2-69 
Mg2Mn O5 0-66 
H4Mn05 15-28 
20 13 
Mn2Mn05 24 01 
. 46-78 
44 14 . 
. 44 14 
Quartz 
. 0-59 
. 0-59 
Combined silica 
. 2 -."lO 
AS2O5 
0-007 
. 0 007 
Moisture 
. 0-15 
. 0 15 
99 -817 
100 037 
Add oxygen unused 
. 0-46 
. 0-24 
100-277 
100-277 
If I express the correct composition, then we must suppose that the 
hright facets represent the braunite and that the homogeneous fine- 
grained ground-mass consists of an intimate mixture of psilomelane and 
hematite. If II be correct then the bright facets nmst be due to hematite 
grains in a ground-mass of psilomelane. As II does not account for the 
2*50% of combined sihca we must suppose that I is probably the cor- 
rect interpretation. 
The following analyses of manganese-ores from this deposit were kindly 
supplied by Messieurs Jambon and Cie. :— 
1 
2 
3 
Manganese ..... 
Iron ..... 
Silica . .... 
Phosjjhorus ..... 
52-91 
5 -36 
6-17 
0-06 
48 -83 
9-28 
5-73 
0-08 
51-75 
8-27 
8-80 
0 -03 
All dried at 
21° F. 
Moisture ..... 
0 -40 
0 -92 
Nos. 1 and 2 were hand-specimens described respectively as ' bright ore ' and 
' soft black.' Analysis by Messrs. J. and H. S. Pattinson of Newcastle. 
No. 3. — Probably a hand- specimen. Analysis by Dr. Pearson of London. 
