Pyrite

Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department  Peru

Specimen size: 11.3 × 11.2 × 6.3 cm = 4.45” × 4.41” × 2.48”
Main crystal size: 3.9 × 3.9 cm = 1.54” × 1.54”