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This is a beautiful specimen consisting of a group of lustrous black SPHALERITE crystals on most sides of a SPHALERITE matrix with some minor CHALCOPYRITE from the Casapalca Mine, Caspalca, Chicla District, Huarochiri Province, Lima department, Peru. The specimen is 5.7 by 3.5 by 2.5 cms in size or about 2.28 by 1.40 by 1.00 inches and weighs 88.7 grams.