Chalcopyrite with Sphalerite

Commodore Mine, Creede District, Mineral County, Colorado  USA

Specimen size: 9.9 × 7.9 × 3.7 cm = 3.90” × 3.11” × 1.46”
Main crystal size: 1.4 × 1.4 cm = 0.55” × 0.55”