Pyrite, Pyrrhotite, Gypsum
Cabinet, 10.9 x 7.8 x 6.9 cm
La Condesa Mine, Santo Domingo, Chihuahua, Mexico

Sparkly pyrite covers strange narrow, peak-like crystals of elongated pyrrhotite (classic for the locality, but rare in this replacement form by pyrite), with little snowballs of gypsum scattered here and there for accent. Ex. Dave Stoudt Collection.