Calcite

La Florida mining area, Herrería-Valdáliga-Rionansa, Comarca Costa Occidental/Saja-Nansa, Cantabria  Spain

Specimen size: 5.2 × 4.1 × 2.7 cm = 2.05” × 1.61” × 1.06”
Main crystal size: 2.0 × 1.6 × 1.7 cm = 0.79” × 0.63” × 0.67”