Class VIII: Silicates
From The Gemology Project
| Clas VIII | Silicates |
|---|---|
| Andalusite | Al2SiO5 |
| Beryl | Be3Al2 (SiO3)6 |
| Iolite (Cordierite) | Mg2Al4Si5O18 |
| Garnet | X3Y2Si3O12 (X = Mg, Fe or Ca) (Y = Al else Fe3+ or Cr) |
| Jadeite | NaAlSi2O6 |
| Nephrite | Ca2(MgFe)5(Si4O11)2 |
| Topaz | Al2SiO4(FOH)2 |
| Tourmaline | (Na1+, Ca2+)(Li1+, Mg2+, Al3+). (Al3+, Fe3+, Mn3+)6(BO3)3 (Si6O18) (OH)4 |
| Peridot | Mg2SiO4, Fe2SiO4 |
| Zircon | Zr(SiO4) |
