Pošepnýite
Pošepnýite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula (Cu⁺₃₊ₓ ₃₋ₓ)Σ₆(Hg²⁺₄₋ₓCu⁺₂₊ₓ)Σ₆Sb₄(Se₁₂.₅ ₀.₅)Σ₁₃ (0 ≤ x << 2).
It crystallizes in the cubic crystal system (space group I-43m). It is a member of the Tetrahedrite structural group.
Key properties: Mohs hardness 3.5–4; specific gravity 6.23; Metallic luster.
IMA symbol Pšý, IMA status: approved, named in 2020.
Found in a low-temperature, complex, selenide assemblage in a vein-type hydrothermal uranium deposit.
It is found associated with Příbramite, dzharkenite, ferroselite, tiemannite, hakite-(Hg), tetrahedrite-(Zn), antimonselite, uraninite, calcite. Distribution From the dump of shaft No.
The mineral was named to honor František Pošepný (1836-1895), a geologist and a founder of modern economic geology.