The most important IGNEOUS MINERALS SILICATES Individual tetrahedron silicates Olivines (Fe,Mg)2SiO4 Complete solid solutions of Forsterite and Fayalite Forsterite Mg2SiO4 - Fayalite Fe2SiO4 - Single chain silicates Pyroxenes - - Orthopyroxenes (Mg,Fe)2Si2O6 - Ca Clinopyroxenes (Mg,Fe,Ca)2Si2O6 Augite Na Clinopyroxenes (Na,Al)2Si2O6 - Double chain silicates Amphiboles - - Ca Amphiboles Ca2(Fe,Mg)5Si8O22(OH)2 Hornblende Na Amphiboles Na2(Fe3+,Fe2+)5Si8O22(OH)2 - Sheet silicates Muscovite mica KAl3Si3O10(OH)2 - Biotite mica K(Fe,Mg)3AlSi3O10(OH)2 - Framework silicates Ca-Plagioclase CaAl2Si2O8 Anorthite Na-Plagioclase NaAlSi3O8 Albite K-Feldspar KAlSi3O8 Sanidine, Orthoclase, Microcline Quartz SiO2 -  Other important SEDIMENTARY MINERALS NON-SILICATES Hematite Fe2O3 Oxide Calcite and Aragonite CaCO3 Carbonate Dolomite CaMg(CO3)2 Carbonate Malachite Cu2CO3(OH)2 Carbonate Azurite Cu3(CO3)2(OH)2 Carbonate Halite NaCl Chloride Gypsum CaSO4·2H2O Sulfate Pyrite FeS2 Sulfide Chalcopyrite CuFeS2 Sulfide Galena PbS Sulfide Apatite Ca5(PO4)3(F,OH,Cl) Phosphate Fluorite CaF2 Fluoride Back to the Top | Back to the Images and Notes Page | Back to the Home Page © Alessandro Grippo, 1994-2011 Los Angeles, California last updated: January 5, 2011