Calcite

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

Specimen size: 3.7 × 7.0 × 6.2 cm = 1.46” × 2.76” × 2.44”
Main crystal size: 2.6 × 2,5 × 2.0  cm = 1.02” × 0.79” × 0.79”