Calcite with sand inclusions

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

Specimen size: 6.8 × 3.1 × 2.8 cm = 2.68” × 1.22” × 1.10”
Main crystal size: 1.9 × 1.5 cm = 0.75” × 0.59”