A cluster of bright octahedral pyrite crystals that are actually a cast, presumably after pyrrhotite. Blady indentations are visible under the specimen, and pyrrhotite is the most likely guess for Huanzala.

This this is incredibly bright and lustrous.  If you leave it under a lamp on a table, you will see small reflections on the ceiling.

Pyrite has long been a staple of the Peruvian mineral dealers, though since Fujimori"s privatization program caused many mines to come under the control of foreign multinationals (Huanzala included) specimen production at many of the most famous mineral localities has severely slowed or stopped all together, a result of increased mechanization, better explosives, and changes in company policy.  I often hear older collectors balking at the pyrite prices at shows-- once upon a time you could buy this stuff by the pound, but the fact is that even in Peru, you will not find them cheaply-- especially good ones.

This is an older piece from a collector in Peru, and an example of material that is no longer quite as plentiful as it once was.