Dolomite

Asturreta Quarry, 'el pozo', Eugui, Esteríbar, Comarca Auñamendi, Chartered Community of Navarre (Navarre)  Spain (1958)

Specimen size: 7.6 × 6 × 7.3  cm = 2.99” × 2.36” × 2.87”
Main crystal size: 2.2 × 2 cm = 0.87” × 0.79”