Calcite with sand inclusions

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

Specimen size: 5.2 × 4.1 × 3 cm = 2.05” × 1.61” × 1.18”
Main crystal size: 3.7 × 2.4 cm = 1.46” × 0.94”