58 
MANGANESE DEPOSITS OF INDIA : MINERALOGY. 
[ Part I : 
The ditetragonal pyramid x is also fairly often present, oue of 
its commonest combinations being with p, as in fig. 1 ; but as the 
angles are somewhat rounded these crystals tend to be barrel-shaped 
in aspect. Fig. 5 shows a combination of /?, x, ij, m, and c, this being the 
only example of the face in found on the crystals from this locality. 
Fig. 5. — Braunite, Kacharwahi. Fig. 6. — Biaunite twin, Kacharwahi. 
Another crystal, which, if perfect, would be some 4 inches long, shows 
one face of r, in addition to the forms p and x shown in fig. 1 . Besides 
^ . these simple crystals, twins are very abundant 
Twins. r ^ ^' ^ 
in this deposit. One of the commonest is a simple 
contact twin on the plane e or (101), shown in fig. 6. Since the fun- 
damental pyramid of braunite approaches very closely to the cubic 
octahedron, the edges AB and BC of fig. 6, instead of showing a 
I" 
Fio. 7.— Braunite twin, Kacharwahi. Fig. 8.— Braunite twin, Kacharwahi. 
