This specimen has a metallic golden brightness to it that looks manmade-brighter and more metallic even than modern Peruvian material can be. It is an old specimen from the collection of the late Dr. Richard Heck. Displayed one way, there is a large twin to the left, and the piece balances standing up like a triangle. Displayed on its side, the large, complex chalcopyrite twin graces the bottom, and smaller crystals rise above it to form a pagoda of sharp, golden-brassy color. So bright is it, that it leaps out of a case as the most metallic mineral in the Heck collection, amongst sphalerites, pyrites, and other species. It is just vividly colorful and brilliantly lustrous. One of the highlights of this fine old Mexican mineral collection. Joe Budd photos.