What you have is a cluster of calcite of the most INCREDIBLE and beautiful form, flowering on top of a natural base of glittery pyrite. The calcites are scalenohedral compound crystals whose faces consist of a myriad of lustrous, cut-glass-like subfaces. Peru turns out specimens by the ton, but rare and unique specimens such as this are just as hard to obtain and valuable from Peru as from anywhere. Never seen another like this.