868 MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [PaRT IV : 
portion of admixed psilomelane. The following three analyses of picked 
hand-specimens were carried out at the Imperial Institute, London : i — 
8oft ore. 
Soft ore with 
Hard ore. ] 
s^ericitic films. 
982 
994. 
995. 
Manganese dioxide (Mn02) . 
42-86 
33-78 
49-42 
Manganese prdto^ide (MnO) 
39 09 
36-40 
35-20 
Ferric oxide (Fe203) .... 
4-13 
1712 
4-82 
Alumina (Al*'03) • . * . 
1 • GO 
0 - 13 
0'16 
Baryta (Had) 
0-89 
0-21 
0-00 
Lime (CaO) ..... 
0-72 
1-35 
0-63 
Magnesia (MgO) .... 
0-25 
0-25 
0-34 
Combined silica (SiOa) 
6-98 
8-06 
6-17 
Free silica {Si02) .... 
2-07 
1-20 
1-64 
Phosphoric tjxidc (P2^5) • • 
0'37 
0 49 
0-15 
Arsenic oxide (AP2O5) 
0-008 
0-012 
0-019 
Combined water (H2O) 
0-40 
1-00 
1-27 
Moisture at 100°C. (H2O) . 
0-10 
0-10 
0-15 
Carbon dioxide (CU2) 
0"35 
0-07 
0'06 
99-818 
100- 172 
100-029 
Manganese ..... 
57-41 
49-60 
58-55 
Iron ...... 
2-89 
11-98 
3-37 
Silica ...... 
O-O.'S 
9-26 
7-81 
Phosphorus ..... 
0-16 
0-21 
0-06 
Moisture ...... 
O-IO 
0-10 
0-15 
Specific gravity ..... 
4-54 
4-502 
4-272 
Spec. 982 — collected in level 1 
Spec. 994— do. do. 2 
Spec. 995— do. do. 3 
1 The following additional constituents were later found in these specimens — 
982 
994 
995 
NiO, C03O4, CuO .... 
0-015 
0-014* 
0-028 
K2O 
0-18 
0-05 
0-14 
Na20 
0-.50 
0-49 
0-42 
• Mainly NiO. 
2 These values were determined at the Imperial Institute. As one would expect 
No. 994 to have a lower G. than 995, I took the specific gravities of the duplicate 
specimens o f these retained in the Geological Survey of India OfiBce and found 
the value for No. 994 -=4-04 and for No. 995 = 4-52. 
