Calcite with sand inclusions

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

Specimen size: 3.6 × 2.2 × 2.9 cm = 1.42” × 0.87” × 1.14”
Main crystal size: 1.3 × 1 cm = 0.51” × 0.39”