908 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [PaRT I V : 
Tliis, as well as the two sauiples of which, the analyses are given on 
page 909, indicates that the manganese-ores of tliis mine average about 
half bra unite and half psilomelane. 
Another variety that is not uncommon, especially in the north- 
west side of the -pit, is a smooth ore, looking very like metallic lead, and 
havdng a hardness of 4. It usually contains remains of spessaitite- 
garnet. The follomng analysis of a piece of this ore was carried out at 
the Imperial Institute.! 
Specimen No. 1079. 
Manganese peroxide 30 ■ 96 
Manganese protoxide ......... 22 "00 
Ferric oxide . . . . . . . . . , . 7'49 
Alumina ........... 0 '40 
Baryta 0 • 78 
Lime 2-31 
Magnesia 0'15 
Silica (combined) . . . , . . . . . . r41 
Silica (free) 17-72 
Phosphoric oxide .......... 0'05 
Arsenic oxide .......... 0"005 
Combined water . . . . . . . . . . 0 • 16 
Moisture at 100°C. 4-21 
Carbon dioxide . . . , . . . . . . O'U 
99-755 
Specific gravity . . . . . . , . . . 3"22 
This is equivalent to : — 
Manganese . . . . . . . . . . .40-43 
Iron . . . . . . . . . . . .5-24 
Silica 19-13 
Phosphorus 0-02 
Moisture 4-21 
and shows that such ore should be rejected on account of its low man- 
ganese and high silica. 
On page 116 it is shown that the analysis corresponds to a mixture 
of a mineral of the formula 6Mn3Og.Fe2O3.8H2O, with quartz and 
spessartite. To this mineral, related to psilomelane, the name beldon- 
grite has been temporarily given. 
There is still another variety of ore ; this is rather coarsely crystalline, 
compact, and steel grey in colour, with a somewhat yellowish or bronzy 
lustre in the sun. It is quite different to any other variety I have seen 
1 The following additional constituents have since been determined : — 
NiO, C03O4, CuO* 0-018 
K2O 0-01 
NagO . 0-33 
* Chiefly cobalt. 
