Calcite with sand inclusions

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

Specimen size: 5.4 × 3.8 × 2.9 cm = 2.13” × 1.50” × 1.14”
Main crystal size: 2.9 × 1.4 cm = 1.14” × 0.55”