Chalcocite

Tongshankou Mine, Edong, Daye, Huangshi Prefecture, Hubei Province  China (2019)

Specimen size: 3.4 × 2.5 × 2.2 cm = 1.34” × 0.98” × 0.87”
Main crystal size: 0.7 × 0.3 cm = 0.28” × 0.12”