Miessiite
Miessiite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Pd₁₁Te₂Se₂.
It crystallizes in the cubic crystal system (space group Fd3m). It is a member of the Isomertieite structural group.
Key properties: Mohs hardness 2–2.5; specific gravity 10.94; Metallic luster.
IMA symbol Mie, IMA status: approved, named in 2006.
With gold and PGM nuggets in a placer sample from a river draining glaciofluvial gravels, sands, terraces, poorly-sorted sandy till and weathered bedrock.
It is found associated with Stillwaterite, isomertieite, mertieite-II, cooperite, braggite, kotulskite, vincentite, tantalite, thorianite, pyrite, magnetite, chromite, isoferroplatinum.
The name commemorates the locality, the Miessijoki river (in Saami language, Miessijohka).