Rutilated quartz
Varietyof Quartz
Rutilated quartz is quartz enclosing needle-like crystals of rutile. As a variety of Quartz, it shares that species' composition (SiO2), crystal structure, and hardness; the distinction is the appearance defined above.
Photos
About Quartz (parent)
Full reference data — crystallography, X-ray diffraction, and cited physical properties — is on the Quartz species page.
| Formula | SiO2 |
|---|---|
| Hardness (Mohs) | 7 |
| Specific gravity | 2.6-2.64 |
| Density (calculated) | 2.65 |
| Crystal system | trigonal |
| Color range | black, blue, brown, colorless, green, red, yellow |
| Luster | dull, greasy, vitreous |
| Streak | white |
About Rutile (minor)
Full reference data — crystallography, X-ray diffraction, and cited physical properties — is on the Rutile species page.
| Formula | TiO2 |
|---|---|
| Hardness (Mohs) | 6.645 |
| Specific gravity | 4.18-4.25 |
| Density (calculated) | 4.233 |
| Crystal system | tetragonal |
| Color range | black, brown, green, red, violet, yellow |
| Luster | adamantine, metallic |
| Streak | brown |