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Occurrence of Gem Variety Green Sphalerite and Dyscrasite in Rocks of the Aravalli Supergroup, India


Affiliations
1 Geological Survey of India, Western Region, Jaipur 302 004, India
2 Hindustan Zinc Limited, Zawar Mines, Udaipur 313 901, India
 

The Zawar Belt in Udaipur district, Rajasthan (Figure 1), the host of polymetallic assemblage of Pb, Zn, Ag, Cd has a history of mining and smelting for zinc going back to 2100 years old1–3. Recently, green coloured gem variety of sphalerite has been found in Zawar mine associated with galena and dyscrasite (Ag3Sb). This variety is different from the conventionally mined ore mineral of Zn which is mainly brown and honey brown in colour. This is the first report of green sphalerite from India. Previously it has been reported from Madan Orefield, Bulgaria4. The major rock types in Zawar Belt are arkosic quartzite, greywacke, phyllite, carbonaceous phyllite and dolomite of the Aravalli Supergroup of the Palaeoproterozoic age. The Pb–Zn mineralization is mainly confined to the dolomite of Baroi Magra Formation, Udaipur Group, Aravalli Supergroup.
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  • Occurrence of Gem Variety Green Sphalerite and Dyscrasite in Rocks of the Aravalli Supergroup, India

Abstract Views: 416  |  PDF Views: 125

Authors

Shubhabrata Mukhopadhyay
Geological Survey of India, Western Region, Jaipur 302 004, India
Abhishek Anand
Geological Survey of India, Western Region, Jaipur 302 004, India
S. K. Rajput
Hindustan Zinc Limited, Zawar Mines, Udaipur 313 901, India

Abstract


The Zawar Belt in Udaipur district, Rajasthan (Figure 1), the host of polymetallic assemblage of Pb, Zn, Ag, Cd has a history of mining and smelting for zinc going back to 2100 years old1–3. Recently, green coloured gem variety of sphalerite has been found in Zawar mine associated with galena and dyscrasite (Ag3Sb). This variety is different from the conventionally mined ore mineral of Zn which is mainly brown and honey brown in colour. This is the first report of green sphalerite from India. Previously it has been reported from Madan Orefield, Bulgaria4. The major rock types in Zawar Belt are arkosic quartzite, greywacke, phyllite, carbonaceous phyllite and dolomite of the Aravalli Supergroup of the Palaeoproterozoic age. The Pb–Zn mineralization is mainly confined to the dolomite of Baroi Magra Formation, Udaipur Group, Aravalli Supergroup.

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DOI: https://doi.org/10.18520/cs%2Fv116%2Fi6%2F892-894