Chrysoprase is the green variety of Chalcedony. Its color ranges from a light, minty-green to a deep apple-green. The unique, rich color of Chrysoprase is caused by impurities of nickel, as this gemstone most frequently originates in nickel-rich Serpentine deposits.
| Chemical Formula | SiO2 (with a high level of nickel impurities) |
| Color | Green |
| Hardness | 7 |
| Crystal System | Hexagonal |
| Refractive Index | 1.54Â -Â 1.55 |
| SG | 2.63Â -Â 2.65 |
| Transparency | Translucent to nearly opaque |
| Double Refraction | .009 |
| Luster | Vitreous to waxy |
| Cleavage | None |
| Mineral Class | Quartz (Chalcedony) |
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