Chalcopyrite

Bad Harzburg mining area (Hasselbach), Goslar, Lower Saxony/Niedersachsen  Germany

Specimen size: 6.4 × 5.3 × 3.6 cm = 2.52” × 2.09” × 1.42”
Main crystal size: 1 × 0.7 cm = 0.39” × 0.28”