Bornite is a copper iron sulfide mineral commonly found in hydrothermal veins, contact metamorphic rocks and in the enriched zone of sulfide copper deposits. It is a common ore of copper and is easily recognized because it tarnishes to iridescent shades of blue, purple, green and yellow. It is often mined as an ore of copper.
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| Bornite |
Physical Properties
Physical Properties of Bornite |
| Chemical Classification | sulfide |
| Color | brownish bronze on a fresh surface, iridescent purple, blue, and black on a tarnished surface |
| Streak | grayish black |
| Luster | metallic |
| Diaphaneity | opaque |
| Cleavage | poor |
| Mohs Hardness | 3 |
| Specific Gravity | 5.0 to 5.1 |
| Diagnostic Properties | color |
| Chemical Composition | copper iron sulfide, Cu5FeS4 |
| Crystal System | tetragonal |
| Uses | Primarily an ore of copper. |
:
Geology.com
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