Class IV: Oxides
From The Gemology Project
| Class IV | Oxides |
|---|---|
| Anatase | TiO2 |
| Brookite | TiO2 |
| Chrysoberyl | BeAl2O4 |
| Corundum | Al2O3 |
| Hematite | Fe2O3 |
| Opal | SiO2nH2O |
| Quartz | SiO2 |
| Rutile | TiO2 |
| Spinel | MgAl2O4 |
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