Efremovite
A variety of Langbeinite Group
What is Efremovite?
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). It has also been reported from several coal mining areas across Europe. It occurs in association with native sulfur, kladnoite [it], mascagnite, and boussingaultite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Efremovite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Efremovite Localities Map
See where Efremovite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Gray, white
- Hardness (Mohs)
- 2
- Density
- 2.52 g/cm³
Chemical Properties
- Chemical Formula
- (NH4)2Mg2(SO4)3
- Elements
- H, Mg, N, O, S
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Efremovite FAQs
How do I identify Efremovite?
Efremovite can be identified by its hardness of 2 on the Mohs scale, Gray color. Look for these key characteristics when examining specimens.
What color is Efremovite?
Efremovite typically appears in Gray, white. Color can vary depending on impurities and formation conditions.
How hard is Efremovite?
Efremovite has a hardness of 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.