A large and exceptionally rich example of this rare sulfoarsenide.  I usually stay away from pieces this large, but it isn't common to see such large masses of this rare species, and the display face was especially clean and well crystalized-- again, not something you often see in such large pieces.  It could easily be trimmed into two nice cabinet specimens-- I might just do that if no one takes it, but for now I want to leave it intact, as it is a really good representative of the species.