68 
MANGANKSE DEPOSITS OF INDIA : MINERALOGY. [ PaRT I : 
magnetic, and the fact that the amphibole, winchite, with which it was 
associated contained a considerable proportion of magnesia, it was 
supposed that analysis would show this mineral to be jacobsite. The 
amount obtained for analysis was 3'05 grammes ; Mr. Blyth foimd 
the specific gravity, by Penfield's method, to be 4' 70. Analysis has, 
however, shown that the mineral contains 10 per cent, of Si02 and 
that it is allied to braunite, if it cannot be actually relegated to this 
species. It is to be regretted that no analysis has yet been made of the 
braunite that occurs in the braunite-psilomelane mixtures of the C. P. 
The results of these analyses are shown below. The Garividi and 
Kacharwahi specimens were analysed by Messrs. J. and H. S. Pattinson 
of Newcastle-on-Tyne, and the KajUdongri specimen by Mr. Blyth. 
Table 7. 
Analyses of Indian braunites. 
Garividi. 
Kacharwahi. 
Kajlidongri. 
Number of specimen 
A. 345. 
1110. 
16-815. 
Manganese peroxide 
Manganese protoxide 
37-06 
40-23 
40-93 
36-72 
41-85 
37-98 
Ferric oxide . 
14-14 
5-50 
1-45 
Alumina 
0-90 
0-44 
014 
Baryta 
0-56 
0-53 
0 09 
Lime .... 
0-78 
113 
3-85 
Magnesia 
0-56 
0-38 
4-36 
Potash .... 
013 
016 
Soda .... 
0-21 
0 15 
Silica (combined) . 
8-25 
8-60 
10-26 
Sulphur 
0 03 
0-04 
Phosphoric oxide 
0-07 
0-08 
Arsenic oxide 
Nil 
Nil 
Cobaltous oxide 
0 05 
0-20 
Nickelous oxide 
Nil 
NU 
Cupric oxide . 
0 03 
0-05 
Lead oxide 
Nil 
NU 
Zinc oxide 
Nil 
NU 
Titanic oxide 
0-06 
0 03 
Chlorine and fluorine 
Nil 
Nil 
Combined water 
0-25 
0-38 
Moisture at 100"C . 
0-25 
0 10 
1-57 
Carbon dioxide 
Nil 
Nil 
100 05 
99-85 
100 -63 
Manganese 
51 -88 
57-86 
65-29 
Iron .... 
9 90 
3-85 
101 
Specific gravity 
4-79 
4-79 
4 -704 
