Franckeite with Berthierite

Item Description

This is one of the rarest sulfosalts in the world. This specimen is a fairly rich, incredibly rare, good quality, crystallized specimen of the triclinic lead, tin, iron, antimony sulfosalt Franckeite consisting of somewhat "sword"-shaped crystals forming spherical aggregates which are associated with minor acicular Berthierite. A great quality specimen for somebody looking to own a rare and attractive "black" mineral association specimen. This is also good opportunity to acquire something that is rarely offered in the open market. Franckeite 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 pieces like this are few and far between these days. A wonderful rare species from one of the most classic Bolivian mines!