Nagyágite (Pb)4S with known occurrence associated with gold ores. Nagyágite crystals are opaque and dark grey to black coloured.
It was first described in 1845 for an occurrence at the type locality, Hunedoara County
It occurs in gold–tellurium epithermal hydrothermal. Minerals associated with nagyágite include: altaite , sylvanite , coloradoite, native gold, proustite , arsenopyrite, calaverite , galena