658 MA^TGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [PaRT TV : 
This is equivalent to : — 
Manganese . . . . . . . . 49 3.'> 
Iron 6-25 
Silica (total) 2-80 
Phosphorus ... .... 0-253 
On the south and east edges of the top of the hill C, some very fine- 
grained, often jaspery, quartzites of red, pink, grey, white, and dark 
Ijrown tints, crop out. Apparently interbedded with them are bands of 
psilomelane, which, though evidently only replacement products, often 
attain a state of great apparent homogeneity and purity. They vary 
from 1 to 6 inches in thickness, averaging 2 to 4 inches, and often 
sweep round and join so as to enclose lenticular patches of quartzite, as is 
shown by the accompanying sketch copied from the cross-fracture of a 
block of this rock. 
Fig. 39.— Quartzite partly replaced by manganese-ore. 
