Dolomite with Siderite

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

Specimen size: 15.8 × 9.4 × 3.9 cm = 6.22” × 3.70” × 1.54”
Main crystal size: 1 × 0.8 cm = 0.39” × 0.31”