Calcite with sand inclusions

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

Specimen size: 6.2 × 3.7 × 2.4 cm = 2.44” × 1.46” × 0.94”
Main crystal size: 2.2 × 1.3 cm = 0.87” × 0.51”