Sphalerite with Tennantite (variety binnite) on Dolomite

Binn Valley (Binntal), Wallis (Valais)  Switzerland

Specimen size: 6 × 5 × 4.2 cm = 2.36” × 1.97” × 1.65”
Main crystal size: 0.6 × 0.5 cm = 0.24” × 0.20”