Calcite

Vicat Quarry, Montalieu-Vercieu, Morestel, Isère, Auvergne-Rhône-Alpes  France

Specimen size: 9.5 × 7.1 × 5.5 cm = 3.74” × 2.80” × 2.17”
Main crystal size: 3 × 1.2 cm = 1.18” × 0.47”