Calcite with sand inclusions

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

Specimen size: 6 × 4.9 × 4.1 cm = 2.36” × 1.93” × 1.61”
Main crystal size: 2.6 × 2.1 cm = 1.02” × 0.83”