A classic and mineralogically interesting specimen featuring pyrite pseudomorphs after pyrrhotite from the renowned Trepča (Stan Terg) Mine. The original pyrrhotite crystals have been fully replaced by pyrite, preserving the original crystal form while displaying a brassy metallic luster and subtle surface texture typical of this replacement process. The pseudomorphs are accompanied by well-associated minerals, including pale brown siderite, metallic lead-gray galena, and dark resinous sphalerite, creating a rich and characteristic Trepča assemblage. The combination of species and the clear pseudomorphic transformation make this piece both scientifically appealing and visually attractive. A representative and collectible specimen from one of Europe’s most famous polymetallic localities, valued for its paragenesis, classic associations, and display quality.