Sphalerite with Bournonite and Siderite

La Mure coal mines, La Mure, Matheysine-Trièves, Grenoble, Isère, Auvergne-Rhône-Alpes  France (±1970)

Specimen size: 6.5 × 4.3 × 1.6 cm = 2.56” × 1.69” × 0.63”
Main crystal size: 1.6 × 1.5 cm = 0.63” × 0.59”