This is a very impressive, display specimen of Ferberite from Bolivia. The piece features several sharp, lustrous, aesthetic, bladed, jet-black crystals in a fan-shaped formation, with a wonderful little accenting "closed twin" directly in the center of the specimen. The crystals have unusual serrated edges for a very stylish touch. These Bolivian Ferberites are often underrated and stand up well against any other Ferberites from China or Panasqueira. This piece was from the famous find in 1999 at Tasna. Ex. Brian Kosnar Collection.