Sphalerite

Troya Mine, Mutiloa, Comarca Goyerri, Guipúzcoa / Gipuzkoa, Basque Country (Euskadi)  Spain (1991)

Specimen size: 6.8 × 4.2 × 2.9 cm = 2.68” × 1.65” × 1.14”
Main crystal size: 0.8 × 0.8 cm = 0.31” × 0.31”