Chalcocite from the trap-rock quarries of NJ ?! This is a significant large specimen from a small find of the mid-1990s, which was quickly dispersed among NJ enthusiasts (of which Charlie was one!). It is the richest of the few I have seen, with crystallization over nearly all the surface. The crystals are flat, but sharp, and mostly complete. This is a very important and fine New Jersey specimen, and a rarely crystallized copper species for the state.