The chemical formula of mineral Catamarcaite is inidcated by Cu6GeWS8. This mineral Catamarcaite commonly occurs as a thin rim lining cavities and fractures in chalcocite-bornite ore. Mineral Catamarcaite is most commonly found at the old dumps near the La Rosario vein, Capillitas epithermal deposit, Catamarca Province, Argentina. Catamarcaite was named after the locality. Catamarcaite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. Catamarcaite has no cleavage display even whenn evaluated closely with the aid of polarizing microscope used in the field of optical mineralogy. Catamarcaite is most commonly found colored gray in hand sample. Most crystals of mineral Catamarcaite are found opaque in appearance. Catamarcaite is also usually found with brittle to irregular fracture which is a very brittle fracture producing irregular fragments. Catamarcaite is also found as aggregates that are made of numerous individual crystals or clusters. Sometimes Catamarcaite is also found in granular from. This is generally occurs as anhedral to subhedral crystals in matrix. The hardness measure of mineral Catamarcaite is usually found 3.5 when evaluated using the Mohs scale method. Catamarcaite is also found showing metallic luster. Mineral Catamarcaite is also commonly found leaving a black streak when rubbed on white porcelain streak plate. Catamarcaite is also showing weak anisotrophism in shades of gray. It also has very weak bireflectance in oil, absent in air. The interference color displayed by mineral Catamarcaite is usually of grayish white with a distinct brownish tine with red internal reflections. Catamarcaite is found to be not pleochroic. Catamarcaite is also not radioactive.