Atheneite is a rare palladium, mercury arsenide mineral with formula (Pd,Hg)₃As associated with palladium-gold deposits. Its composition parallels that of arsenopalladinite (Pd₈(As,Sb)₃), isomertieite (Pd₁₁Sb₂As₂) and meritieite-II (Pd₈(Sb,As)₃)(Cabral, 2002).