CYLINDRITE with TOYOHAITE and POTOSIITE

Rare pseudocubic crystals of metallic maroon Toyohaite (Ag2FeSn3S8) on botryoidal metallic micro-bladed crystals of Franckeite and Cylindrite from the Pirquitas silver-tin Deposit in Argentina. Franckeite from this locality was once named Potos'ite, but this species has since been discredited and is now classified as a Sn(II)-poor (tin II) variety of Franckeite. A nice example of some extremely rare minerals.

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Crystal Classics

Tucson, Arizona, USA