Aventurine
Rock / aggregate
Aventurine is quartz rock glittering with included mineral flakes. It is a polycrystalline material rather than a single mineral species; its dominant component is Quartz.
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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 Muscovite (minor)
Full reference data — crystallography, X-ray diffraction, and cited physical properties — is on the Muscovite species page.
| Formula | KAl2(Si3Al)O10(OH)2 |
|---|---|
| Hardness (Mohs) | 2-2.5 |
| Specific gravity | 2.76-3 |
| Density (calculated) | 2.812 |
| Crystal system | monoclinic |
| Color range | brown, colorless, gray, green, red, rose, violet, yellow |
| Luster | pearly, silky, vitreous |
| Streak | red |