Magnesio-ferri-fluoro-hornblende
Magnesio-ferri-fluoro-hornblende is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₂(Mg₄Fe³⁺)(Si₇Al)O₂₂F₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Amphibole structural group.
Key properties: specific gravity 3.315; Vitreous luster; optically biaxial.
IMA symbol Mffhbl, IMA status: approved, named in 2014.
Found in vugs in a welded tuff.
It is found associated with Tridymite, todorokite, magnetite, hematite.
The name refers to a calcium amphibole with dominant magnesium and ferric iron in the C site and 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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