Tiger's eye
Rock / aggregate
Tiger's eye is golden-brown chatoyant quartz. It is a polycrystalline material rather than a single mineral species; its dominant component is Quartz.
Photos
About Quartz (major)
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 Riebeckite (minor)
Full reference data — crystallography, X-ray diffraction, and cited physical properties — is on the Riebeckite species page.
| Formula | ܆Na2(Fe2+3Fe3+2)Si8O22(OH)2 |
|---|---|
| Hardness (Mohs) | 6 |
| Specific gravity | 3.433-5 |
| Color range | black |
| Luster | vitreous |