Ferri-winchite
Ferri-winchite is an IMA-recognized mineral species in the silicate class, with the chemical formula (NaCa)(Mg₄Fe³⁺)Si₈O₂₂(OH)₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Amphibole structural group.
Key properties: Mohs hardness 5.5; specific gravity 3.14; Greenish gray streak; Vitreous luster; optically biaxial.
IMA symbol Fwnc, IMA status: approved, named in 2004.
Found in veins cutting pyroxene fenite in an alkaline igneous complex.
It is found associated with Calcite, quartz, pyrite.
As the Fe3+ analog of winchite.
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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