Home Chemical Formulas of Gemstones Chemical Formulas of Gemstones Beryl Be3Al2Si6O18 Chrysoberyl BeAl2O4 Coral CaCo3 Corundum Al2O3 Diamond C Feldspar Plagioclase Series: (Na,Ca)Al(Al,Si)Si2O8 Alkali Feldspar Group: Mixtures of Orthoclase -KAlSi3O8 and Albite -NaAlSi3O8 Garnet Almadine - Fe3Al2(SiO 4 ) 3 Andradite - Ca3Fe2(SiO 4 ) 3 Grossular - Ca3Al2(SiO 4 ) 3 Pyrope - Mg3Al2(SiO 4 ) 3 Spessartine - Mn3Al2(SiO 4 ) 3 Uvarovite - Ca3Cr2(SiO 4 ) 3 Jade Nephrite - Ca2(Mg,Fe)5(Si8O22) (OH)2 Jadeite - NaAl(Si2O6) Lapis Lazuli Lazurite - (Na,Ca)8(AlSiO4 ) 6 (SO4,S,Cl)2 Opal Hydrated Silica - SiO2.nH2O Peridot (Mg,Fe)2(SiO4) Quartz SiO2 Spinel MgAl2O4 Topaz Al2SiO4(F,OH)2 Tourmaline XY3Al6(BO3 ) 3 (Si6O18) (OH4) [X is usually Na but may be replaced by Ca; Y is one of several metal ions] Turquoise CuAl6(PO4 ) 4 (OH)8.4H2O Zircon ZrSio4

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