Calcite with sand inclusions

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

Specimen size: 3.4 × 2.4 × 2.3 cm = 1.34” × 0.94” × 0.91”
Main crystal size: 2.7 × 1.3 cm = 1.06” × 0.51”