Fractured aggregate of catamarcaite (Ct) composed of twinned grains with red internal reflections; Dg is digenite, Sp sphalerite. Oil immersion, crossed polars. (CanMin, v44:1481).
Location:
Bornite-rich ore from old dumps near the La Rosario vein, Capillitas epithermal deposit, Catamarca Province, Argentina.