Sphalerite with Siderite

La Mure coal mines, La Mure, Matheysine-Trièves, Grenoble, Isère, Auvergne-Rhône-Alpes  France

Specimen size: 8.7 × 7 × 3 cm = 3.43” × 2.76” × 1.18”
Main crystal size: 0.2 × 0.2 cm = 0.08” × 0.08”