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Types of Minerals Chapter 4.2 Silicates (96% of Earth’s crust) - contain silicon and oxygen (SiO4). - include feldspar, quartz, mica, & olivine. - tetrahedron crystalline structure. Carbonates - contain a metal bonded to carbonate (CO3). - include calcite (CaCO3) and dolomite (CaMg(CO3)2) Oxides - contain a metal bonded to oxygen. - include hematite (Fe2O3), magnetite (Fe3O4), & corundum (Al2O3) Ores - rocks that contain a mineral that can be mined at a profit. - if demand for a particular mineral declines, the rock containing it may possibly be no longer be considered an ore. Gems - minerals that are prized for their rarity and beauty.