Ferrokësterite
Ferrokësterite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Cu₂FeSnS₄.
It crystallizes in the tetragonal crystal system. It is a member of the Sphalerite, Stannite structural group.
Key properties: Mohs hardness 4; specific gravity 4.49; Black streak; Metallic. Anisotropism: Weak; in shades of gray. Bireflectance: Weak. R1 –R2: 23.9–26.8 (470), 26.0–27.0 (546) luster.
IMA symbol Fkës, IMA status: approved, named in 1985.
Found in greisen-bordered sulfide veins in granite.
It is found associated with Arsenopyrite, cassiterite, chalcopyrite, sphalerite, chalcocite, quartz.
The name refers to its content of iron, ferrum, and relation to kesterite.
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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