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Efremovite

Type Locality
Coal mine No. 43, Kopeisk, Chelyabinsk coal basin, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia
Mineral Data
(NH4)2Mg2(SO4)3
Strunz: 
7.AC.10
Physical Properties
Crystal System: 
Isometric
Hardness: 
2.0