Chap. XXX.] panch maiials : siVAnAJruR. 
657 
The analysis can be recalculated into terms of its mineralogical com- 
position as follows : — 
Apatite .... 
Braunite (containing 6-00 re203) 
I'silomclane, composed of : — 
.\l4(Mn() ) 
HngMnOs 
Ca2Mn05 
M<r2.Mn05 
Na4Mn05 
('u2Mn05 
Zn2Mn05 
H4Mn05 
Mn2Mn05 
Quartz 
Sulphur 
TiOa . 
Moisture 
0-84() 
42- 17 
2!)!) 
lOG 
1- 61 
2- 14 
3r)l 
0-42 
om 
0-08 
7-71 
3.T81 
53-36 
Oxygen unused 
53-36 
2-70 
0021 
0-04 
0-60 
99-737 
0-43 
100-167 
From this it will be seen that the specimen consisted of about 42 per 
cent, of braunite and 53 per cent, of psilomelane, with small amounts of 
other constituents. 
A little further to the east along this ridge there was, at the point B, 
another outcrop, this time consisting of psilomelane and pyrolusite with 
much residual quartzite, sericitoid slate, and vein quartz. The photograph 
(Plate 17) shows this outcrop. A sample taken all along the top of the 
ridge, starting from A and going east as far as the bend to the north, 
consisted mainly of psilomelane with some pyrolusite. A partial analysis 
by Messrs. J. & H. S. Pattinson gave the following result : — 
Manganese peroxide 
Manganese protoxide 
Ferric oxide . 
Baryta 
Silica (combined) 
Silica (free) . 
Phosphoric oxide 
Arsenic oxide 
Water (combined) . 
Moisture at 100° C. 
Sample No. A. 46. 
71-87 
5-06 
8-92 
1- 22 
0-80 
2- 00 
0-58 
0-055 
3 00 
0-35 
