Metallic inclusions of the three very rare Pt-Pd telluride minerals: oulankaite, telargpalite & moncheite, from Lukkulaisvaara Massif (Olanga River, Northern Karelia, Karelia Republic, Russian Federation) in a polished section that was analyzed by the former owner of the specimen: the Vandenbroucke Museum, from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Oulankaite
Oulankaite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Pd₅Cu₄SnTe₂S₂.
It crystallizes in the tetragonal crystal system.
Key properties: specific gravity 10.27; Metallic luster.
IMA symbol Oul, IMA status: approved, named in 1990.
Found in hydrothermally altered, sulfide-rich pods and stringers of coarse-grained to pegmatitic gabbronorite, in a sill-like body of micro-gabbronorite.
It is found associated with Chalcopyrite, telargpalite, moncheite, sperrylite, tulameenite, kotulskite, irarsite, Cl-rich ferropargasite.
The name refers to the Oulanka river near the ore deposit.