Siderite with Calcite and Pyrite

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

Specimen size: 16.2 × 9.8 × 5.3 cm = 6.38” × 3.86” × 2.09”
Main crystal size: 2.7 × 1.3 cm = 1.06” × 0.51”