GEOLOGICAL SURVEY OF INDIA. 
Memoirs, Vol. XXXVII, PI.t 
Feimor. Photomicrograph. Be>inose,Coilo., Doby. 
X i6. 
Photomicrograph by reflected light of a 
polished and etched slice of manganese-ore 
from Ramdongri, Nagpur district, C. P. 
The dark part is braunite (crystalline), and 
the light part, or matrix in which the 
braunite is set, is psilomelane. 
