MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [ PaRT IV: 
to grow with the retreat towards its edge of the manganese, and 
later, as the patch became larger, a white spot would have appeared in 
its middle, and this, with the retreat of the iron after the manganese, 
would have increased in size until the retreat of iron and manganese 
could go on no further, on account of being stopped by manganese and 
iron retreating from another white patch. What this occurrence 
seems to me to teach is that firstly there are still rocks near the 
manganese-ore deposits containing original manganese, and, secondly, 
that there is a great tendency for changes to be set up in such 
rocks with the segregation of the manganese and iron, not only 
from the other constituents of the rock, but from each other. The 
foregomg deductions are more or less confirmed by the fact that the 
black zones react for manganese rather strongly, probably more 
strongly than the original rock, though it would need a quantitative 
test to confirm this ; whilst the red zones and white zones do not 
yield any appreciable quantity of manganese although, it will be 
remembered, the fresh rock contains it. 
Further along the tramway line to the ropeway a second somewhat 
similar section is to be seen. Dark irregular drawn-out patches 
are thickly scattered through a light ground. The light parts represent 
what now look like soft white shales, whilst the darker parts are 
yellow ochre in colour and are almost invariably separated from the 
white portions by a thin zone or layer to thick) of hard 
limonite. This, then, is another example of segregation, the segrega- 
ting material being in this case iron alone. Either the original phyllite 
or slate did not contain any appreciable quantity of manganese, or 
the manganese it contained was removed during the changes by 
which the iron was made to segregate. Considering the large amount 
of iron present, it is possible that some of it has been introduced 
by the waters causing the segregation 
Underlying the deposits at both Ritmandrug Main Bed and No. 4 
there is a large amount of variegated and banded lithomargic rock. This 
rock at No. 4 contains numerous black patches 
The Ramaudiug litho- occasional segregations of harder 
marges. ° ° 
oie (psilomelane). Moreover, the manganese-ore 
deposit at No. 4 is seen to send down ' roots ' or projections of man- 
ganese-ore into this lithomargic rock, as shown diagrammatically in 
