Dolomite

Azcárate Quarry, Eugui, Esteríbar, Comarca Auñamendi, Chartered Community of Navarre (Navarra)  Spain

Specimen size: 4.9 × 4 × 3.4 cm = 1.93” × 1.57” × 1.34”
Main crystal size: 2.4 × 2.2 cm = 0.94” × 0.87”