Dolomite

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

Specimen size: 8 × 7 × 5.5 cm = 3.15” × 2.76” × 2.17”
Main crystal size: 3.4 × 3 cm = 1.34” × 1.18”