GY 302 Crystallography and Mineralogy Supplementary Lecture Notes 15 Carbonates Mineral Formula System Calcite (minerals) CaCO3 Hexagonal (Trig) Dolomite CaMg(CO3)2 Hexagonal (Trig) Ankerite CaFe(CO3)2 Hexagonal (Trig) Magnesite MgCO3 Hexagonal (Trig) Siderite FeCO3 Hexagonal (Trig) Rhodochrosite MnCO3 Hexagonal (Trig) Smithsonite ZnCO3 Hexagonal (Trig) Aragonite CaCO3 Orthorhombic Cerrusite PbCO3 Orthorhombic Witherite BaCO3 Orthorhombic Hydrozincite Zn5(CO3)2(OH)6 Monoclinic Malachite Cu2(CO3)2(OH)2 Monoclinic Azurite Cu3(CO3)2(OH)2 Monoclinic Trona Na3(HCO3)(CO3)·2H2O Monoclinic Borax Na2B4O7·10H2O Monoclinic Colemanite Ca2B6O11·5H2O Monoclinic Kernite Na2B4O6(OH)2·2H2O Monoclinic http://www.geol.lsu.edu/henry/Geology3041/lechttp://www.geol.lsu.edu/henry/Geology3041/lectures/26MetaReactions/Fig26-1.jpgData below is from the USGS Mineral Commodities Summary for
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