Eldfellite
Eldfellite is an IMA-recognized mineral species in the sulfate class, with the chemical formula NaFe³⁺(SO₄)₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Zinkosite structural group.
Key properties: specific gravity 3.062; White streak; Vitreous luster.
IMA symbol Edf, IMA status: approved, named in 2007.
Found as a near surface fumarolic encrustation.
It is found associated with Tamarugite, ralstonite, anhydrite, gypsum, bassanite, hematite, opal, cryptohalite, chessexite, unnamed Na3Fe(SO4)3 phase.
The name refers to the first locality, the Eldfell volcano, Iceland.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
Browse more E minerals or help write this entry.