Chalcopyrite
| Formula | CuFeS2 |
| Origin | unknown |
| Description | Chalcopyrite with multicoloured tarnish colours |
| Classification (Lapis) | Sulfides |
| Crystal System | tetragonal |
| Hardness | 3,5 – 4,0 |
| Colour | Brass-yellow, may be tarnished and iridescent |
| Streak | Greenish black |
| Luminescence | none observed |
| Lustre | metallic |
| Transparency (Opacity) | opaque |
| Cleavage | poor |
| Fracture | conchoidal, uneven |
| Magnetism | negative |
| Geological Setting | A primary mineral in hydrothermal veins, stockworks, disseminations, and massive replacements |
| Specific Gravity | 4,28 g/cm3 |
Crystal model
#© Mark Holtkamp
