90 
MANGANESE DEPOSITS OF INDIA : MINERALOGY. [ PaRT I = 
pyramid ; but the few angular measurements I have yet been able 
to make indicate that the mineral is either orthorhombic or tricli- 
nic, more probably the latter, and in either case very closely approach- 
ing the tetragonal form. The striations on the prism faces and the 
dullness of the pyramid faces have up to the present prevented this 
question being settled. 
There occurs at Kajlidongri a fibrous mineral that shows a beautiful 
Fib 1 11 d't ^^^y lustre. Chemical work on this mineral indi- 
cates that it is fibrous variety of hollandite ; it is 
probable that the fibres are parallel to the vertical axis of the 
mineral, this being the direction of the fibrous striation seen on the 
fracture surfaces of crystals of hollandite. The manganate foimd at 
^ „ . , Sitapar occurs in prismatic individuals mixed with 
Hollandite in the . • i i • i 
Chhindwara district, various other minerals, which prevent the mangan- 
ate from developing true crystal faces. But it shows 
a prismatic development, the rough prisms being sometimes as long 
as one inch. At Gowari Warhona, the mineral is found in certain 
layers in the manganese -ore in the form of brilliant crystalline 
interlocking aggregates, the prisms being usually about 2-^ to J inch 
in length. This mineral must also be present in the ores of Mandvi 
Bir, Junawani, and Junapani. For the complete 
Hollandite in the i • r ■ e t /••tj iij 
ores found in the analysis of a piece from Junawani indicates that 
crystalline limestones, the ore is a mixture of braunite and a manganate, 
Ndgpui c ihiiic ^j^^ latter being present in this particular speci- 
men in the proportion of 66 per cent. The manganate must be either 
crystalline or non-crystalline. In the latter ^case the mineral would 
be psilomelane, which would be easily visible as a dull matrix cement- 
ing the granules of braunite. But, since the whole piece of ore is cryst. 
alline, the manganate must be in the crystalline form ; that is it must 
be hollandite. In the same way the physical aspect of the ores of Mo- 
hugaon, Pali, and Ghogara, in the Nagpur district, taken in conjunc- 
tion with such partial chemical analyses of them as have been made, 
shows that they also contain, in aU probability, a crystalline manga- 
nate. At all the localities for this mineral in the Nagpur district the 
ores are in crystalline limestones. At Balaghat I collected one speci- 
men of manganese-ore showing a veinlet about J inch thick of a 
fibrous silky-looking mineral that at once suggested hollandite. That 
this is hollandite I have little doubt; for the analysis (No. 1146, page 
Mas.sive hollandite, 9 i) that has been made of a picked specimen of 
Bihighat district. a Very common type of crystalline ore in this 
