Calcite

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

Specimen size: 7.1 × 4.4 × 4 cm = 2.80” × 1.73” × 1.57”
Main crystal size: 2.4 × 0.9 cm = 0.94” × 0.35”