Dolomite

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

Specimen size: 5.8 × 3.8 × 3.9 cm = 2.28” × 1.50” × 1.54”
Main crystal size: 3.1 × 2.3 cm = 1.22” × 0.91”