Calcite

Dolomítica Group of Mines, Montehano, Escalante, Comarca Trasmiera, Cantabria  Spain

Specimen size: 7.5 × 6.7 × 4.6 cm = 2.95” × 2.64” × 1.81”
Main crystal size: 5.3 × 2.3 cm = 2.09” × 0.91”