Metallic single crystal group of the extremely rare Cu-Sb-selenide mineral permingeatite in an analyzed specimen by SEM/EDS from the type locality in Czech Republic: Předbořice, Kovářov, Písek District, South Bohemian Region, Czech Republic. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Permingeatite
Permingeatite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Cu₃SbSe₄.
It crystallizes in the tetragonal crystal system (space group I-42m). It is a member of the Sphalerite, Stannite structural group.
Key properties: Mohs hardness 4–4.5; specific gravity 5.82; Metallic. Anisotropism: Strong, with bright colors in rose and green. R1 –R2: (400) 28.9–29.1, (420) 28.4–30.2 luster.
IMA symbol Pmg, IMA status: approved, named in 1971.
A product of epithermal hydrothermal mineralization.
It is found associated with Berzelianite, hakite, eskebornite, umangite, naumannite, hematite, clausthalite, ferroselite, klockmannite, chalcopyrite, pyrite, gold, tetrahedrite.
The name refers to François Permingeat (1917–1988), French mineralogist, University of Paul-Sabatier, Toulouse, France.