740 
M-VNGANESE DEPOSITS OF INDIA : DESORIPTIVE. [PaKT IV; 
fragments . re visible ; but if traced further north the band might bo 
found to reappear at the surface. 
The dip of the band is always to the west side, being only 25° in Sukli 
limits, but about 50° to G0° in Sitapathur. The width of the ore-band was 
measured at two points as 12 feet and 15 to 20 feet, respectively. The 
'country' is nowhere exposed immediately in contact with the ore, but in 
two places fragments of mica- quartz-schist were seen, while on the low 
ridge (No. 2) agranulitic hornblende-gneiss (probably uralitized quartz- 
pj'roxene-gneiss) crops out in large blocks to the west of the ore-band, 
from v/hich it is separated by some coarse felspathic quartzite. 
The ore-band consists in many places of merchantable manganese -ore, 
Character of the especially on Sitapathiir Hill, where it forms in one 
oie-band. place a wall-like outcrop ; but in many places the ore 
is either associated with spessartite-bearing rocks or it gives way ahuost 
entirely to them. On the south slope of Sitapathur Hill is a coarse pegma- 
tite of quartz, pink felspar, and a brown pyroxene 
Brown manganese- i ' ^ ^ it t i 
i)yruxene. that reacts for manganese and sodmm and under 
the microscope is pleochroic in shades of yellow brown. (See pages 
135—6.) 
At one point on top of Sitapathur Hill there weie found, immediately 
to the west of the ore-band, and forming either a 
Manganese-micas. ^^^^ ^^^^ .^^ western wall, several loose blocte 
of a light crimson rock composed chiefly of two species of mica. One of 
these is a beautiful crimson-pink biaxial mica and the other a rich orange- 
brown uniaxial mica. (See pages 197—8.) 
This rock also contains scattered grains of a black manganese-ore 
(braunite?). On the ridge (No. 2) there is some pegmatite containing 
. patches of yellow garnet, presumably spessartite, 
Spessartuem peg- . ^ . , °, , . , , 
uiatite. which it may have taken up from the ore- band 
at the time of injection. Pieces of white vein-quartz containing matr- 
netite were also found in places. 
Most of the ore consists of the hard grey braunite-psilomelane mix- 
, „ ture, the braunite tending in places to be rather 
Nature and quahty ' ^ ■ i ■ i • 
of the ores. coarsely crystalline. One specimen, which is very 
maoTietic, looks Uke a mixture of braunite and psilomelane, but will need 
chemical investigation on account of the fact that the supposed braunite 
is as magnetic as magnetite. A sample was broken off the outcrop along 
