782 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [ParT IV^ 
hillocky ridge of white quartzite, usually s'ciy like veiu-quaitz iD appear- 
ance. 
-Nila 
Mn.-0>"6 1 
JUNGLE 
"^^^^^-^JT^'^^V'vl/U IT C i^IIADTT '* Ull I r\ e- 
QUARTZ 
HILLOCKS 
WITH/Vl;SPESSARTITE 
FLATTISH GROUND WITH RED QUARTZOSE SOIL 
^ THE OR€-B0DY AS EXPOSED 
^ IN THE JUNGLE, 
I THE PORTION OF THE 
I ORE -BODY SAMPLED, 
SCALB> L 
SO 
-L. 
iqo 
_J YABDS. 
Fig. 47. — Sketch-plan oi the Oainnikh and Laklianwaia deposits. 
The ore is hard, black and crystalline, probably braunite, the cry- 
stal individuals showing faces averaging ^ inch across. But nearly 
always there is mixed with the ore a dark brown mineral with inter- 
stitial patches of white to pale flesh-pink colour showing a pearl lustre. 
Under the microscope it is seen that the ore is an altered rhodonite- 
rhodochrosite (MnCOs) rock, the former being the brcwTi and the latter 
the white to pink mineral, and both these minerals will unavoidably 
find their way into cargoes of the ore. The same is the case with the 
sample taken by me, shown in the analysis No. 12 (page 784). 
The rhodonite is of course objectionable on account of its high silica 
content, but as rhodochrosite contains nearly 48 percent, of manganese, 
and the CO2 is easily removed by calcination, it will probably be found 
advisable to retain it in the cargoes, even though its presence may 
slightly lower the manganese percentage. 
As will be seen from the sketch-map, ■ figure 47. only the 
central portion of the deposit was considered worth sampling ; the 
peripheral portion was mostly fairly fresh spessartite-rhodonite-rock 
with a little rhodochrosite. Thus it will be noticed that the core of the 
