Chalcocite on Pyrite

Las Cruces Mine, Gerena-Guillena-Salteras, Comarca Sierra Norte, Seville, Andalusia  Spain

Specimen size: 4.1 × 3.6 × 3.2 cm = 1.61” × 1.42” × 1.26”
Main crystal size: 0.9 × 0.4 cm = 0.35” × 0.16”