Calcite with sand inclusions

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

Specimen size: 4.2 × 2.5 × 2.3 cm = 1.65” × 0.98” × 0.91”
Main crystal size: 2.4 × 1.9 cm = 0.94” × 0.75”