Beryl BeࠣAlࠢSiࠦO₁ࠨ
Chrysoberyl BeAlࠢOࠤ
Coral CaCOࠣ
Corundum AlࠢOࠣ
Diamond C
Feldspar Plagioclase Series:
(Na,Ca)Al(Al,Si)SiࠢOࠨ
Alkali Feldspar Group:
Mixtures of Orthoclase—KAlSiࠣOࠨ and
Albite—NaAlSiࠣOࠨ
Garnet Almadine—FeࠣAlࠢ(SiOࠤ)ࠣ
Andradite—CaࠣFeࠢ(SiOࠤ)ࠣ
Grossular—CaࠣAlࠢ(SiOࠤ)ࠣ
Pyrope—MgࠣAlࠢ(SiOࠤ)ࠣ
Spessartine—MnࠣAlࠢ(SiOࠤ)ࠣ
Uvarovite—CaࠣCrࠢ(SiOࠤ)ࠣ
Jade Nephrite—Caࠢ(Mg,Fe)ࠥ(SiࠨOࠢࠢ) (OH)ࠢ
Jadeite—NaAl(SiࠢOࠦ)
Lapis lazuli Lazurite—(Na,Ca)ࠨ(AlSiOࠤ)ࠦ (SOࠤ,S,Cl)ࠢ
Opal Hydrated Silica—SiOࠢ·_n_HࠢO
Peridot (Mg,Fe)ࠢ(SiOࠤ)
Quartz SiOࠢ
Spinel MgAlࠢOࠤ
Topaz AlࠢSiOࠤ(F,OH)ࠢ
Tourmaline XYࠣAlࠦ(BOࠣ)ࠣ(SiࠦO₁ࠨ) (OHࠤ)
[X is usually Na but may be replaced by Ca;
Y is one of several metal ions]
Turquoise CuAlࠦ(POࠤ)ࠤ(OH)ࠨ·4HࠢO
Zircon ZrSiOࠤ