These are slightly elongated cubes of brassy, mirror bright, unmodified, pyrite. This habit, from Peru, may actually be rarer than that of the octahedrons. The largest crystal is doubly terminated and measures 4.9 cm in length. They are nearly pristine on the display face, with just minor edge wear there and some on back sides as well (it IS there, but it doesnt detract too much, to me). This is a superior pyrite specimen WAY BEYOND the average and mass-produced material. Seldom do you see them so finely articulated, and in a cluster with such individuality