This pyrite is from the Huanzala Mine, Huallanca, Dos de Mayo Povince, Huanco Department, Peru. This a predominately lead-zinc mine but 63 other mineral species can be found there. It is one of the premier locales for pyrite specimens. They can vary in morphology from cubic to octahedral and every combination in between. It is a sulfide containing the elements Fe and S. These large crystals have sharp dipyramidal octahedral habits with a bright brassy gold color. The luster is mirror-like and metallic, This piece has a high iron content which accounts for it’s brilliant luster after being collected over twenty years ago. The largest crystal is about 11 mm across. This piece measures 4 1/4 x 2 1/2 x 1 3/8 inches or 108 x 64 x 35 mm.