Siderite

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

Specimen size: 13.2 × 7.4 × 3 cm = 5.20” × 2.91” × 1.18”
Main crystal size: 3.1 × 2.2 cm = 1.22” × 0.87”