Calcite with sand inclusions

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

Specimen size: 5.1 × 3.9 × 3.9 cm = 2.01” × 1.54” × 1.54”
Main crystal size: 2 × 1.6 cm = 0.79” × 0.63”