Calcite with sand inclusions

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

Specimen size: 5.1 × 4.3 × 3 cm = 2.01” × 1.69” × 1.18”
Main crystal size: 2.4 × 2.1 cm = 0.94” × 0.83”