Dolomite (variety Fe-bearing dolomite) with Pyrite

La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia)  Spain

Specimen size: 11.8 × 9.2 × 4.8 cm = 4.65” × 3.62” × 1.89”
Main crystal size: 2.7 × 1.4 cm = 1.06” × 0.55”