Home > Silver Minerals – October 23 > MS1004 Argentopyrite

Argentopyrite - Sold

Argentopyrite is a silver iron sulfide. The mineral name denotes its silver content using the Latin argentum, and its ore like nature "as a pyrite". Czamanske & Larson (1969) demonstrated the polymorphous relationship between argentopyrite and sternbergite. Yang et al. (2009) solved the crystal structure, and showed a relationship with cubanite. The near hexagonal packing of sulfur atoms in the crystals give the mineral its propensity to form pseudohexagonal twins. This specimen shows elongate crystals, twinned to give a pseudohexagonal cross section. The maximal crystal size is about 0.5 mm, forming on white ankerite rhombohedra.

This specimen was part of the personal collection of Ralph Merrill, proprietor of the prolific mail order business Minerals Unlimited. Merrill's collection card and label also ship with the specimen.