Chalcopyrite
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| Frequency | common |
|---|---|
| Hardness | 3.5 |
| Density | 4.1 |
| Chemical Formula | CuS |
| Core Elements | Cu |
| Thermal Decomposition | CuS
666°C CuO |
Chalcoiron pyrite, along with malachite and azurite is a primary ore of copper. It is a mixture of different copper-sulfur compounds, with occasional iron substitutions. Copper-sulfur proportions include 9:5 (digenite), 6:4 or 5:4 (bornite), 2:1 (chalcocite) and 1:1 (covellite).