Really outstanding single crystal of the very rare palladium mineral arsenopalladinite from the type locality in Itabira (Minas Gerais, Brazil). Many crystal faces can be clearly seen. Analyzed specimen by SEM/EDS. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Arsenopalladinite
Arsenopalladinite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Pd₈As₃.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Stillwaterite structural group.
Key properties: specific gravity 10.4; Metallic. Anisotropism: Strong, red and golden brown to blue-gray in air luster.
IMA symbol Apdn, IMA status: approved, named in 1955.
Found in gold concentrates.
It is found associated with Hematite, palladian gold, atheneite, stillwaterite, palladseite, isomertieite, quartz (Itabira district, Brazil); gpold, palladium, palladesite (Cauê mine.
The name refers to its composition.