Sphalerite with Siderite

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

Specimen size: 3.7 × 3.5 × 2.2 cm = 1.46” × 1.38” × 0.87”
Main crystal size: 0.7 × 0.7 cm = 0.28” × 0.28”