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Formula: (NH4)2Fe2+2(SO4)3
Sulphate, langbeinite group
Crystal System: Isometric
Specific gravity: 2.69 measured, 2.70 calculated
Hardness: 2
Streak: White
Colour: Colourless
Environments
Ferroefremovite is a relatively new mineral, approved in 2019, and to date (March 2022) reported only from the
type locality.
Localities
At the type locality, the "Bocca Grande" fumarole, Solfatara di Pozzuoli, Pozzuoli, Naples, Campania, Italy,
ferroefremovite occurred as cubic crystals up to 0.1 mm across, associated with
adranosite,
adranosite-(Fe),
godovikovite,
huizingite-(Al),
mascagnite
and opal. The fumerole has a temperature of about 160oC
(CM 59.1.59-68).
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