Calcite

Abendröthe Mine, St. Andreasberg mining area, Goslar District, Harz, Lower Saxony/Niedersachsen  Germany

Specimen size: 8.5 × 6.4 × 3.5 cm = 3.35” × 2.52” × 1.38”
Main crystal size: 1.8 × 1.7 cm = 0.71” × 0.67”