Heliodor
Varietyof Beryl
Heliodor is the golden-yellow gem variety of beryl. As a variety of Beryl, it shares that species' composition (Be3Al2Si6O18), crystal structure, and hardness; the distinction is the appearance defined above.
About Beryl
Full reference data — crystallography, X-ray diffraction, and cited physical properties — is on the Beryl species page.
| Formula | Be3Al2Si6O18 |
|---|---|
| Hardness (Mohs) | 7.5-8 |
| Specific gravity | 2.63-2.8 |
| Density (calculated) | 2.851 |
| Crystal system | hexagonal |
| Color range | blue, green, red, rose, white, yellow |
| Luster | vitreous |
| Streak | white |