NATIVE ELEMENTS Carbon Sulfur Gold Silver SILICATES Olivine (Mg, Fe) 2 SiO 4 Quartz SiO 2 Feldspar KAlSi 3 O 8 Tourmaline NaMg 3 Cr 6 Si 6 O 18 (BO 3 ) 3 (OH) 4 Mica KAl 2 (AlSi 3 O 10 )(F,OH) 2 CARBONATES Rhodochrosite (MnCO 3 ) Cerussite (PbCO 3 ) Azurite (Cu 3 (CO 3 ) 2 ) Calcite (CaCO 3 ) SULFATES Copper (II) Sulfate CuSO 4 Calcium Sulfate CaSO 4 Barite BaSO 4 OXIDES Titanium Oxide TiO Cassiterite SnO Iron Oxide FeO Halide = Metal + Halogen (F, Cl, Br, I) HALIDES NaCl SULFIDES Galena PbS Pyrite FeS 2