Ferroefremovite
Ferroefremovite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (NH₄)₂Fe²⁺₂(SO₄)₃.
It crystallizes in the cubic crystal system (space group P2_13). It is a member of the Langbeinite structural group.
IMA symbol Fefr, IMA status: approved, named in 2019.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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