Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Open Access Open Access  Restricted Access Subscription Access
Open Access Open Access Open Access  Restricted Access Restricted Access Subscription Access

Vernadite in Goriajbor Manganese Ores, Gangpur Group, India


Affiliations
1 Minera10gy and Meta110graphy Division, Regional Research Laboratory, Bhubaneswar - 751 013, India
 

   Subscribe/Renew Journal


Characteristics of vernadite in manganese ores from Gangpur Group of rocks, Goriajhor Formation, Sundargarh district, Orissa, have been described. This terrestrial vernadite is distinguished from δ-MnO2 in marine manganese nodules by its well ordered crystallinity and thinner fibrils of submicron size. It appears to be chemically homogenous with the proposed formula: (Ba, K, Fe) MnO2.nH2O. This vernadite probably originated through solution, precipitation and redeposition under supergene conditions and later transformed into cryptomelane or romanechite.
Subscription Login to verify subscription
User
Notifications
Font Size

Abstract Views: 197

PDF Views: 149




  • Vernadite in Goriajbor Manganese Ores, Gangpur Group, India

Abstract Views: 197  |  PDF Views: 149

Authors

B. K. Mohapatra
Minera10gy and Meta110graphy Division, Regional Research Laboratory, Bhubaneswar - 751 013, India
B. R. Nayak
Minera10gy and Meta110graphy Division, Regional Research Laboratory, Bhubaneswar - 751 013, India
R. K. Sahoo
Minera10gy and Meta110graphy Division, Regional Research Laboratory, Bhubaneswar - 751 013, India

Abstract


Characteristics of vernadite in manganese ores from Gangpur Group of rocks, Goriajhor Formation, Sundargarh district, Orissa, have been described. This terrestrial vernadite is distinguished from δ-MnO2 in marine manganese nodules by its well ordered crystallinity and thinner fibrils of submicron size. It appears to be chemically homogenous with the proposed formula: (Ba, K, Fe) MnO2.nH2O. This vernadite probably originated through solution, precipitation and redeposition under supergene conditions and later transformed into cryptomelane or romanechite.