Chalcopyrite with Magnetite

French Creek Mines, St. Peters, Warwick Township, Chester County, Pennsylvania  USA

Specimen size: 4.4 × 3.2 × 2.3 cm = 1.73” × 1.26” × 0.91”
Main crystal size: 1.2 × 0.7 cm = 0.47” × 0.28”