Dolomite

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

Specimen size: 6.4 × 5.6 × 3.4 cm = 2.52” × 2.20” × 1.34”
Main crystal size: 2.4 × 2.3 cm = 0.94” × 0.91”