Tags: Chemical Substance, Mineral.
Efremovite is a rare ammonium sulfate mineral with the chemical formula: (NH4)2Mg2(SO4)3. It is a white to gray cubic mineral. This anhydrous sulfate occurs as constituent in sulfate crusts of burning coal dumps. It is hygroscopic and when exposed to humid air it slowly converts to the hydrate form boussingaultite.It was first described in 1989 for an occurrence in the Chelyabinsk coal basin Southern Urals Russia. It was named for Russian geologist Ivan Antonovich Yefremov (1907–1972).