Pyrrhotite with Dolomite

Santa Eulalia District, Municipio Aquiles Serdán, Chihuahua  Mexico (1966)

Specimen size: 12.6 × 7.4 × 4.4 cm = 4.96” × 2.91” × 1.73”
Main crystal size: 1.5 × 1.4 cm = 0.59” × 0.55”