GEOLOGICAL SURVEY OF INDIA. 
Fig. I. — X 60. 
Black manganiferous quartzite. 
Balaghat mine, Balaghat district, C. P. 
L. L. Fennor, Phototnicrograph. 
Fig. 3.— X 23. 
Vein-quartz being replaced by psilomelane. 
Chik Vadvati, Dharwar district, Bombay. 
Memoirs, Vol. XXXVII, PI. i;, 
Fig. 2. — X 16. 
Black manganiferous quartzite. 
Manegaon, Nagpur district, C. P. 
Bemrose, Coiio., Derby. 
Fig. 4.— X 23. 
Quartz-felspar rock being replaced by 
manganese-ore. 
Garbham, Vizagapatam district, Madras. 
