Delightful specimen! Matrix of brilliant Sphalerite crystals to 2 cm. across, which are studded with tiny golden Chalcopyrites. The Quartz crystals are gem-transparent, to over 4 cm. long, unbroken, and studded with sharp and bright cubes of Pyrite. From the Huaron Mining District, San Jose de Huayllay District, Cerro de Pasco, Daniel Alcides Carrión Province, Pasco. I hand-carried this from Peru over a decade ago & am finally ready to part with it.