These chalcopyrite crystals are from the Huaron Mining District of the Huallay District, Pasco Department, Peru.This area contains 15 mines including the Alimon which is where most mineral specimens come from. The mines are large commercial operations for the extraction of silver and silver related minerals. Twenty-one different mineral species are found in this area including several exceptional sulfides such a chalcopyrite. This specimen consists of a combination of; transparent quartz crystals, black sphalerite crystals, and gold chalcopyrite crystals. Some of the chalcopyrite crystals are covered with silver, micro-tetrahedrite crystals. This piece measures 3 x 2 3/4 x 1 5/8 inches or 76 x 70 x 41 mm.