Ferro-fluoro-edenite
Ferro-fluoro-edenite is an IMA-recognized mineral species in the silicate class, with the chemical formula NaCa₂Fe²⁺₅(Si₇AlO₂₂)F₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Amphibole structural group.
Key properties: Mohs hardness 5–6; specific gravity 3.358; Light brown streak; Vitreous luster; optically biaxial.
IMA symbol Ffed, IMA status: approved, named in 2020.
Found in cavities in volcanic ejecta probably crystallized during a late-stage hydrothermal phase.
It is found associated with Quartz, magnetite, vonsenite.
Prefixes indicate the Fe2+ analogue of edenite with fluorine dominant in the W site.
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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