1138 MANGAKESE DEPOSITS OF INDIA : DESCRIPTIVE. [ PaRT IV : 
Analyses of hand-specimens of Kumsi manganese-ores. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
14 
MnOj . 
82-97 

87-82 
69-76 
83-33 
75-51 

65-41 
70-29 
76-55 

52-19 
■ 
40-06 
33 08 
MnO . 
1-75 
2-93 
1-73 
? 67 
4-58 
3-40 
4-29 
1-74 
1-99 
118 
NU 
FejOs . 
7-85 
1-85 
19-23 
6-64 
10-09 
18-08 
11-76 
14-20 
26-24 
39-46 
4416 
AI2O3 . 
2-50 
1 -80 
2-82 
1-51 
2-41 
5-48 
5-84 
306 
12-74 
1212 
13-04 
CaO . 
103 
0-98 
0-76 
0-C8 
0-59 
1-34 
2-28 
1-01 
1-94 
1-72 
1-91 
MgO . 
0-36 
0-37 
0-28 
0-31 
0-30 
0-52 
0 74 
030 
0-67 
0-40 
036 
KjO & NajO 
0-53 
0-59 
0-81 
1-04 
0-49 
2-35 
2-32 
0-70 
1-52 
1-12 
S1O2 . 
0-95 
0-90 
1-05 
0-60 
2-80 
1-22 
1-36 
0-54 
1-24 
2-72 
2-90 
Comb i u e d 
2 06 
2-76 
3-56 
2-22 
3-23 
■2-17 
1-02 
1-85 
1-62 
1-36 
402 
water.* 
P2O5 . 
0-03 
Total . 
100-00 
100-00 
100-00 
100-00 
100 00 
99-97 
99-90 
99-95 
10015 
100-14 
100-00 
Manganese . 
53-82 
57-81 
45-44 
65-52 
51-29 
43-98 
47-74 

49-75 

34-54 
26-87 
21-23 
Iron . 
5-60 
1-21 
13-46 
4-65 
7 00 
12-66 
8-23 
9-94 
18-37 
27-62 
30-91 
* Water determined by I'ifference in Nos. 1 to 5, and 14. 
Notes: — 
1. Cavernous mixture of crystalline pyrolusite with dull pyrolusite or wad. 
2. Massive pyrolusite, with some of the bright grey crystalline mineral, and 
possibly a little psilomelane, somewhat cavernous. 
3. Black wad (dark brownish-black streak) with thin veinlets of psilomelane. 
4. Dull grey psilomelane, with a fair quantity of the bright grey crystalline 
mineral, and a little Mack wad. 
5. Light grey psilomelane with hard bright specks. 
6. Dull grey psilomelane with a few minute bright specks. 
7. Lead-like psilomelane. 
8. Compact firm black wad, passing into, not very hard, neaily black psilomelane 
with light grey psilomelane veinlets. 
9. Oolitic, almost lead-like |isilomel<ine; matrix and oolites tho same, former 
more abundant, fracture passes through the oolites. 
10. Oolitic, with black wad matrix ; and oolites of softish psilomelane, fracture 
passes round the oolites. 
14. Ooliti?, with brownish blaok matrix (chooolate streak) ; dolites tend to consist 
of psilomelane. 
of alumina. The manganese on the other hand tends to be highest in the 
pyrolusites and lowest in the pisolitic or oolitic psilomelanes. It will 
also be seen that in all the ores, practically the whole of the manganese 
is present in the peroxide form, with very little in the protoxide form. 
This of course points to the general absence of braunite, which is borne 
out by the small amounts of silica, which, though it may be present in 
the form of braunite in some cases, is probably nearly always present as 
free quartz. The mean of the figures in this table is as follows : — 
Manganese . . . • . • . .46-68 
Iron 10-86 
Silica 1'34 
