Wiktionary
atheneite
n. (context mineral English) A rare metallic compound usually associated with palladium–gold deposits, chemically similar to graphite.
Wikipedia
Atheneite
Atheneite is a rare palladium, mercury arsenide mineral with formula (Pd,Hg)As associated with palladium– gold deposits. Its composition parallels that of arsenopalladinite (Pd(As,Sb)), isomertieite (PdSbAs) and meritieite-II (Pd(Sb,As))(Cabral, 2002).