A lot of black granules of the extremely rare palladium selenide palladseite in a completely analyzed specimen by SEM/EDS from a locality in Brazil (Serra Pelada Claims, Curionópolis, Carajás Province, Pará, Brazil). Presence of O, C and Si in the spectrum is due to residual carbonates, silicates and atmospheric O2. Atomic ratios in the spectrum are only approximate, due to the technique used. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Palladseite
Palladseite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Pd₁₇Se₁₅.
It crystallizes in the cubic crystal system (space group Pm-3m).
Key properties: specific gravity 8.3.
IMA symbol Pds, IMA status: approved, named in 1975.
Sparingly in residual concentrates from gold washings (Itabira district, Brazil); in specularite and magnetite (Cauê mine, Itabira district, Brazil).
It is found associated with Arsenopalladinite, isomertieite, atheneite (Itabira district, Brazil); palladian gold, isomertieite, sudovikovite (Cauê mine, Itabira district, Brazil).
The name refers to the chemical composition, PALLADium and SElenium.