1018 MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [ PaRT IV 
Brauuitc? and liollandite? 
melane are sometimes present, instead of the pseudo-manganite orpyro- 
lusite radiations ; sometimes these Unings of psilomelane form the basis on 
which the radiations rest. Traversing the ores in veinlets there is some- 
times the lead-like variety of psilomelane. Not infrequently theie are 
patches and veinlets of a bright grey metallic - 
looking mineral that has not yet been satisfac- 
torily identified. It suggests hollandite in appearance. But it fails to 
give a satisfactory reaction for barium, whilst it contains a certain 
amount of silica. It is slightly magnetic, and fairly hard. Hence for 
the present it can be regarded as probably braunite ; but this is not 
certain and needs confirmation by complete analysis, for it is not 
typical of braunite. It is also not certain that all the bright mineral 
is of one species. There may be some examples of hollandite. 
I have very few data as to the chemical composition of the man- 
ganese-ores of the Sandur Hills. Though the 
the ore?''' compositioa of ^^^^ ^f^^^ j^^j. ^^^^ ^^^^^ ^^^^^j^ 
cient manganese to be classed as first-grade, 
those mined at Ramandrug are partly of second and partly of third 
grade; and, generally speaking, it can be said that no first-grade ores 
have yet been mined in any quantity. The reason for this is that 
these ores usually contain a considerable amount of iron taking the 
place of a portion of the manganese that one would otherwise expect 
to be present from the appearance of the ores. But it is possible 
that when some of the Kamataru deposits are opened up it may be 
found possible to obtain considerable quantities oi" ore running over 50% 
manganese. The following are some analyses supplied by Mr. Ghose of 
bulk samples of the ores of Ramandrug Main Bed. They were car- 
ried out by V. Spiera of Kamthi : — 
Average sam- 
ple, foot of 
main outcrop. 
October 1905. 
Average samples of stacks, January 1906. 
Manganese 
i8-60 
43-69 
40-26 
47-65 
Iron . . . - 
12-74 
12-89 
12-54 
1117 
Silica 
0-70 
0-80 
115 
0-90 
Phosphorus 
0-009 
0-009 
0-015 
0-012 
