SA96AC1: Aggregate of crystals formed by the positive and the negative rhombohedron, twinned, very sharp and transparent. They have grown on a first generation of translucent white rhombohedrons of the same Dolomite. This kind of twin is very uncommon at Eugui, so, historically, they have been very appreciated by collectors.
Asturreta Quarry, Eugui, Esteríbar, Comarca Auñamendi, Chartered Community of Navarre (Navarre)  Spain (±1965)

Specimen size: 14.5 × 11.4 × 8.7 cm = 5.71” × 4.49” × 3.43”

Main crystal size: 5 × 4.2 cm = 1.97” × 1.65”