Calcite w/ Pyrite and Marcasite

Wise Lake Formation, Conco Mine,

North Aurora, Kane County, Illinois

USA

9x3.5x8cm

Striking calcite specimen featuring lustrous golden pyrite and silvery marcasite accretions. The calcite crystals display excellent clarity and geometric form, while the metallic sulfide minerals create striking contrast and visual depth. A classic association from the Wise Lake Formation at the historic Conco Mine in Illinois. Ideal for collectors seeking specimens with multiple mineral phases and strong aesthetic appeal.