Copper is known for its metallic reddish-brown color. Though not a gemstone or precious metal, it is included here in this guide for its historical significance as an ancient metal. Ornaments, coins, and statues have been fashioned from Copper since ancient times. Its distinct color and availability throughout history have afforded it great significance, though in modern times Copper is almost exclusively an industrial metal.
| Chemical Formula | Cu |
| Color | Metallic, Red, Orange, Brown |
| Hardness | 2.5Â -Â 3 |
| Crystal System | Isometric |
| SG | 8.9 |
| Transparency | Opaque |
| Double Refraction | None |
| Luster | Metallic |
| Cleavage | None |
| Mineral Class | Copper |
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