Calcite with sand inclusions

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

Specimen size: 5.6 × 3.6 × 2.9 cm = 2.20” × 1.42” × 1.14”
Main crystal size: 3.2 × 2.3 cm = 1.26” × 0.91”