Calcite with inclusions of sand

Forêt Fontainebleau, Fontainebleau, Seine-et-Marne, Île-de-France  France (XIX Century)

Specimen size: 4.7 × 3.3 × 3 cm = 1.85” × 1.30” × 1.18”
Main crystal size: 1.7 × 1.5 cm = 0.67” × 0.59”