Dolomite (twinned)

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

Specimen size: 12.5 × 11.8 × 10.2 cm = 4.92” × 4.65” × 4.02”
Main crystal size: 6.6 × 4 cm = 2.60” × 1.57”