A solid matrix of Enargite with a thin layer of pyrite on which random Hutchinsonite crystals are distributed. Hutchinsonite is a rare hydrothermal mineral and the only locality on MinDat in the western hemisphere for hutchinsonite is the Quiruvilca Mine. Locality: Quiruvilca Mine, Santiago de Chuco Province, La Libertad Region Peru Composition: thallium, lead, arsenic sulfosalt and copper arsenic sulfide
