Morpho-Chemistry of Rutile in Dengura Manganese Ore Bodies of Koira Valley, Orissa

Minute discrete grains of rutile present in manganese ores of Dengura, Koira valley, Sundergarh district, exhibit imperfect columnar and crystallographic forms and an outstanding illustration of twinning. EPMA and EDAX results indicate the presence of Fe, Mn, Cr, Al, Ba, K and Ta, Nb in minor proportion, in rutile crystals. Some of these clements are either present in limited solid solution or later got introduced into its structure during late epigenetic processes. These are detrital grains, pre-existing in the host shale and later affected by solution during epigene manganese are formation.