ClIAT'. XXXVI.] NAGPUR : KACIlAinVAlII. 925 
The ores found in this deposit consist partly of the fine-grained psilo- 
, I ■•, nielane-braunite mixture and partly of more uni- 
Niiliiro iitui (|iinlity . . 
of the oios. formly crystalline material of both fine and medium 
grain. I5(^t li varieties usually show black films, and cavities containing 
either ferruginous matter or a black powder. 
A specimen of ore composed of the former variety, with some patches 
of the crystalline medium-grained variety, was analysed at the Imperial 
Institute with the following result '.^ — 
specimen No. 1093. 
Miinganese |)eioxidc . . . . . . . 41-,34 
Manganese protoxide ....... 42-16 
Ferric oxide ......... 4'48 
Alumina 0-39 
Baryta OoO 
Lime . . . . . . . . . . 1'41 
Magnesia 0-83 
Siliea (combined) ........ 8'18 
Silica (free) 0-46 
Phosphoric oxide ........ 0-20 
Arsenic oxide ......... O'OOS 
Combined water ........ 0'63 
Moisture at 100°C. . 0-05 
Carbon dioxide 009 
100-225 
Specific gravity ........ 4-73 
This is equivalent to : — 
Manganese . . . . . . . . . 58 "74 
Iron 3*14 
Silica .... 8 '64 
Phosphorus 0 -00 
Moisture . ....... 0 'Oo 
The analysis can be expressed minetalogically as follows : — 
Apatite .......... 0 '40 
Calcite 0-20 
Braunite (containing 4 48 r"e203) . . . . . S2 "04 
Mn2Mn05 14-46 
Impurities : — 
AI2O3 . . 0-39 
Coo 1-04 
Mgo 0 '83 
H2O 0-63 
Quartz 0 ■4() 
AS2O5 0 -005 
Moisture 0 "05 
100-565 
Subtract o.xygen assumed . . . . . . . 0'34 
100 -225 
1 The following additional constituents have since been determined : — 
NiO, Coabi, CuO 0-08 
K2O trace 
Na20 . 0-23 
