Calcite with sand inclusions

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

Specimen size: 5.1 × 4.9 × 4.8 cm = 2.01” × 1.93” × 1.89”
Main crystal size: 0.8 × 0.6 cm = 0.31” × 0.24”