Dolomite

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

Specimen size: 10.4 × 10.1 × 6.6 cm = 4.09” × 3.98” × 2.60”
Main crystal size: 4 × 2 cm = 1.57” × 0.79”