Beautiful huge fluorescent Calcite crystal on iridescent Marcasite/Pyrite matrix from Black Jack Mine, Galena, Jo Daviess County, Illinois, USA. A stunning specimen from the historic and well-known Black Jack Mine in Galena, Illinois, featuring a large, vivid fluorescent calcite crystal nestled on a glistening matrix of marcasite and pyrite. The calcite displays impressive size and clarity, with a bright vivid fluorescence red/pink colour under UV light that dramatically highlights its elegant crystal architecture. The Black Jack Mine is famous for producing outstanding combinations of calcite with classic sulfides, and this piece perfectly embodies the region’s rich mineral heritage. The metallic luster of marcasite and pyrite creates a striking contrast with the calcite’s luminosity, making this an exceptional centerpiece for collectors seeking premium specimens from the legendary Illinois lead-zinc district.