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 dipyramidal octahedrans and every combination in between. It is a sulfide containing the elements Fe and S. This is an exceptional stalactite (or stalagmite) formation made up of a variety of crystal habits including; cuboctahedral, cubic, and mirror image interpenetration twins. The piece can stand unassisted and it can be displayed from any side as each has unique qualities. The large crystal at the top averages 20 mm on edge and has several modified characteristics. It was collected over 30 years ago. It has a high iron content which accounts for its mirror luster after all these years.This piece measures 2 x 1 1/2 x 1 1/4 inches or 50 x 38 x 32 mm.