Calcite

Bigrigg Mine, Bigrigg, West Cumberland Iron Field, former Cumberland, Cumbria  United Kingdom

Specimen size: 11.8 × 8.4 × 6.7 cm = 4.65” × 3.31” × 2.64”
Main crystal size: 2.8 × 1.7 cm = 1.10” × 0.67”