This is a dramatically crystallized specimen of iridescent, bluish-purple chalcocite from mining in the mid-1990s here at this now reclaimed and closed-off locale. The largest crystal measures 2.5 cm across, and the whole surface is covered with sharp and colorful crystals. A large and very significant specimen from a mine that lasted from 1994-1997 and yet during that short period became world-famous for these incredible chalcocites.