This is a really good piece of Stibarsen, a rare arsenic antimonide alloy, from this famous mineral producing region in the Czech Republic. For years, stibarsen was labeled as allemontite, which is no longer a species. The species is now stibarsen, and allemontite is an archaic/invalid term. This piece features the classic botryoidal form that is well-known from Pribram. A good representation of this classic old material. From the collection of Juan M. Casanova.

A rich group of cube octahedral galena crystals, with ancient exfoliated zones and certain luster, but with the old patina we have preferred not to remove, since it is an old piece from the classic Príbram mining area. They are disposed on a matrix with pyrite and quartz crystals. With a handwritten label.

Botryoidal arsenic aggregates from this classic locality in former Czechoslovakia. It was collected at level 7 of the uranium mine number 21. At the time, due to its antimony content, it was called "Stibarsen" or "Allemontite". Good size. Arsenic specimens from this mine are rare.