Calcite with sand inclusions

Bellecroix, Fontainebleau, Seine-et-Marne, Île-de-France  France

Specimen size: 6 × 4.7 × 4.1 cm = 2.36” × 1.85” × 1.61”
Main crystal size: 2 × 1.2 cm = 0.79” × 0.47”