100 MANGiNESE DEPOSITS OF INDIA.: MINERALOGY. [ ParT I: 
found, carefully took their specific gravities, and sent to the analysts the 
whole of the specimen in the powdered condition. Guguldoho is in the 
Nagpur district. Central Provinces ; Avagudem in the Vizagapatam 
district, Madras ; and Tekrasai in the Singhbhum district, Bengal. 
Table 12. 
Analyses of Indian psilomelanes. 
Guguldoho. 
Avagudem. 
Tekiasai. 
Tekrasai. 
Tekrasai. 

Number of Specimen. 
1157 
A. 372 
A. 380 
A. 381 
J. 917 
Manganese peroxide (Mn02) 
8313 
73-35 
70-78 
79-87 
82-44 
Manganese protoxide (MnO) 
637 
3-61 
7-63 
6-61 
6-47 
Ferric oxide (Fe203) . 
1-50 
5-71 
0-21 
0-07 
0-50 
Alumina (AI2O3) 
n- 1 
u 10 
0 00 
O'lO 
V o\J 
V iO 
U 40 
Baryta (BaO) . 
0 03 
2-43 
15-08 
5-16 
207 
j-.ime \^ti\j) . . • 
0'21 
0-54 
O'OS 
0'47 
Magnesia (MgO) 
018 
0-25 
0-25 
0-22 
0-16 
Potash {K2O) . 
3- 10 
3 25 
0 20 
2- .33 
2-63 
SodafNa20) . 
045 
0-02 
015 
018 
0-18 
Combined Silica (Si02) 
0-25 
0-45 
0-05 
0-05 
0-10 
Free Silica (Si02) . 
nil 
nil 
nil 
nil 
nil 
Sulphur .... 
0*034 
1/ \Jt>V 
Phosphoric oxide (P2O5) . 
0-838 
0791 
0-737 
0-676 
0-696 
Arsenic oxide (AS2O5) 
0003 
nil 
nil 
nil 
nil 
Cobaltous oxide (CoO) 
0- 1 
0-15 
0-25 
0-20 
0-35 
Nickelous oxide (NiO) 
nil 
nil 
0-20 
015 
0-05 
Cupric oxide (CuO) . 
0 002 
0-04 
0-08 
0-04 
001 
Lead oxide (PbO) . 
nil 
nil 
nil 
nil 
nil 
Zinc oxide (ZnO) 
ml 
0-15 
0 .30 
0-40 
0-55 
Titan/0 oxide (TiO?). 
001 
trace 
nil 
ml 
nil 
Chlorine .... 
nil 
nil 
trace 
trace 
nil 
Fluorine .... 
nil 
nil 
nil 
nil 
nil 
Combined water (H2O) 
3-40 
3-80 
3-30 
2-60 
2-65 
Moisture at 100°C. . 
0-25 
205 
0-45 
0-45 
0-35 
Carbon dioxide (CO2) 
nil 
nil 
nil 
nil 
nil 
99-994 
100-175 
100-086 
100-083 
100-151 
Manganese 
57-78 
49-18 
50-66 
55 61 
57-14 
Iron .... 
1-05 
4-00 
0-15 
0-05 
0-35 
Silica (total) 
0-25 
0-45 
0-05 
0-05 
0-10 
Phosphorus 
0-366 
0-346 
0-322 
0-295 
0-304 
Specifio gravity 
4-26 
3-86 
4-54 
4 41 
4-38 
