Chrome-Rich Green Garnets from Mesoproterozoic Sausar Fold Belt, Tirodi Area, Central India

Uvarovite is rarest of the species of garnet group. Green chromiferous garnets with uvarovite, as subordinate molecules are also known. Chrome rich green garnets (uvarovite) has been reported from the Tirodi manganese deposit of Central India. The X-Ray data (unit cell a=11.98Å) of these garnets is comparable with the synthetic uvarovite data. The end-Member calculations based on electron microprobe studies show dominance of andradite and uvarovite with minor spessartine molecules. Distinct spatial association between chrome garnets, Mn ore and intrusive pegmatites has been observed. Chrome rich green garnets are probably pre-Sausar in age and formed in association with older supracrustals whose enclaves occur in Tirodi gneisses.