A very interesting and unique Wurtzite specimen. The piece consists of lustrous, chocolate brown, crystallized "casts" after an unknown mineral which are associated with bright silvery Galena crystals on matrix. These specimens came out around 2002, and I only saw a few of them. I was never able to obtain an accurate locality, but it is certainly attractive for the species, and one of the most unusual Wurtzites that I have seen from Bolivia.