030 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [PaRT IV : 
the same band of ore brought up by a fold. Sample No. .30 was taken 
from the ore being worked here. 
Owing to the water in the main pit I could examine it round the 
Nature of tlio ore- edges only, where there was the usual overburden 
of alluvial clay and pebble-ore resting on mica- 
schists, which apparently form both the hanging and foot walls of the 
deposit. The following section, seen at the east end, may be taken 
as typical of the overburden : — 
.'J feet alluvial clay with scattered pisolites of manganese-ore, 
2-| feet rather small talus-ore with some quartzite pebbles, 
8 feet of a mixture of small pebbles of iiiangane.se-ore and quartzite, with clay 
and debris of mica-schist. 
10 feet waved mica-schists of various colours, red, yellow, white, and black, due to 
impregnation with oxides of iron and manganese. (In one place the 
micH -schist eontait'.ed altered magnetite crystals up to } inch diameter.) 
Along the south edge of the quarry the mica-schist was seen to rest 
on interbanded dark -grey to black quartzites, and poor quality man- 
ganese-ore, with bands of spessartite, etc., in both ore and quartzite. 
This dark-grey to black qtiartzite is seen under the microscope to owe 
its colour to very abundant minute inclusions of idiomorphic crystals 
of some black manganese- mineral. It also, in one case, contains a 
pyroxene having pleochroism in pink and green. At the west end of the 
pit, the rock that corresponds to the ore-band occupying the middle 
of the pit has been left unquarried and consists of very massive spessar- 
tite-rhodonite-rock, only partly altered to manganese-ore. Along the 
north side of the pit were exposed, interbanded with one another, mica- 
schist, manganese- ore, gondite, and quartzite ; it was not quite certain 
that the full width of the deposit had been exposed in that direction. 
At one place near the south edge of the quarry there was exposed a large 
mass of soft white rock of quartz and felspar, with many black man- 
ganiferous patches, due doubtless to impregnation or replacement of 
this rock by manganese oxide. This quartz-felspar-rock is probably 
an intrusive in the ore-body. 
From the waste heaps, both of the main quarry and of the new ex- 
cavations, some fine specimens of coarsely crystal- 
Spessartite crystals. ^ , ^ i ^ • ' i mi 
lized spessartite-quartz-rock were obtained, ihe 
spessartite crystals would some of them, if perfect trapezohedra, be 1 ^ 
to 2 inches in diameter. Besides the usual trapezohedral faces, which 
are, as at Chargaon, often striated parallel to the faces of the rhomb- 
dodecahedron, a few crystals show tiny hexoctahedral faces ; while 
on one, rhomb-dodecahedral faces are rather well developed (see 
pages 171 to 174). 
As already noticed no ore of good quality was visible in the main 
Nature and quality of pit. It is Said that when this pit was first 
the ores. Started the ore analysed 52 per cent, manganese 
