Bournonite on Tetrahedrite

Saint-Pierre-de-Mésage, Vizille, Grenoble, Isère, Auvergne-Rhône-Alpes  France

Specimen size: 3.3 × 2.5 × 2 cm = 1.30” × 0.98” × 0.79”
Main crystal size: 1.9 × 0.4 cm = 0.75” × 0.16”