Hyacinth (zircon)
Varietyof Zircon
Hyacinth (zircon) is red-orange gem zircon. As a variety of Zircon, it shares that species' composition (Zr(SiO4)), crystal structure, and hardness; the distinction is the appearance defined above.
About Zircon
Full reference data — crystallography, X-ray diffraction, and cited physical properties — is on the Zircon species page.
| Formula | Zr(SiO4) |
|---|---|
| Hardness (Mohs) | 7.5 |
| Specific gravity | 4.68-4.7 |
| Density (calculated) | 4.655 |
| Crystal system | tetragonal |
| Color range | brown, colorless, gray, green, red, yellow |
| Luster | adamantine |
| Streak | red |