Franckeite (rare) (ex Rich Kosnar Collection)

Item Description

One of the rarest sulfosalts in the world. This specimen is a very rich, incredibly rare, good quality, crystallized specimen of the triclinic lead, tin, iron, antimony sulfosalt Franckeite consisting of somewhat "sword"-shaped crystals oriented into spherical aggregates. This piece is a great thumbnail for somebody looking to own a rare and highly displayable specimen of this hard to find materal. A good opportunity to acquire something that is rarely offered in the open market for a great price. This species belongs to the only group of minerals that forms in naturally "round" or "cylindrical" shaped crystals. This specimen is over 30 years old and was part of the best find of the material. There were only a handful of good specimens, and well crystallized display pieces are few and far between.