Cuxv. XXXVT.] 
NAGPUR : LOIIDONGRI. 
917 
the ore-body, was a horizontal channel, about a foot in diameter and height, 
which ran for some feet into the deposit. The surfaces of the hiyers 
of ore in the clay-fdied spaces are sometimes covered with fine crystals 
of braunite. By offering rewards to his quarr)'-. 
men, Mr. E. L. Young, v, ho is in charge of this 
deposit, has succeeded in obtaining several fine crystallizations, which 
he has kindly permitted me to examine. The faces shown are the 
tetragonal pyramid, the di-tetragonal pyramid, the basal plane, the 
prisms of the first and second orders and possibly one or two other forms. 
The most commonly developed face is that of the pyramid, and when this 
is alone the mineral takes the form of the tetragonal octahedron, of which 
a fine example with faces two inches across is figured on Plate 2. 
As already noted (page 915), practically the whole thickness of the 
Nature and ((iiality ore-deposit consists of manganesc-ore, nearly all 
of the ores. q£ yy}^^^^ is marketable under favourable market 
conditions. There are two chief varieties of ore. One, the comparative 
abundance of which distinguishes this deposit from nearly all the other 
deposits of the Nagpur-Balaghat area, is a coarsely crystalline variety 
showing hard shining facets of braunite up to J inch across, usually asso- 
ciated with a fair amount of dull psilomelane. All the pieces of this 
variety contain, here and there, cavities, lined with soft substance**, 
either black or red, probably oxides of manganese and iron, respectively. 
The second, and more abundant variety, is the fine-grained hard grey 
crystalline ore showing patches of somewhat more coarsely crystalline 
braunite. This contains a much larger proportion of psilomelane and is 
also somewhat cavernous with soft whitish, red and black substances 'n 
the cavities. 
In addition to the above two varieties there is also a small quantity 
of ore somewhat like the soft blackish variety found at Ss'itak (see page 
899). A specimen (No. 1089) of the crystalline ore was analysed at the 
Imperial Institute with the following result -.^ — 
Manganese peroxide 
Manganese protoxide 
Ferric oxide . 
Alumina 
Baryta . 
Lime 
Magnesia 
Silica (combined) 
Speciinen Xo. 1089. 
1 The following additional corstituents have since been deteim 
NiO. C03O4, CuO 
K2O 
Na20 
IV 
47-63 
33-63 
8-78 
0 03 
0-84 
0 85 
0-.-8 
6 83 
ni-d : — 
0-032 
0-14 
0-17 
x 2 
