Tennantite Locality: Tsumeb Mine (Oshikoto) Region, Namibia Size :7 × 7 cm — Photo: Didier Descouens · CC BY 3.0
Tennantite-(Fe)
Also known as: Arsenical fahlore.
Tennantite-(Fe) is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Cu₆(Cu₄Fe₂)As₄S₁₃.
It crystallizes in the cubic crystal system (space group I-43m). It is a member of the Tetrahedrite structural group.
Key properties: Mohs hardness 3–4.5; typically gray or black.
IMA symbol Tnt-Fe, grandfathered status — known before the IMA’s founding, named in 1819.
Collections: Metals & Native Elements, Collector Favorites.
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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