EESA06H3 Chapter 5: Chapter 5 study guide

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13 Mar 2011
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In order for it to be stable, it must ever 1. Be balanced by enough positively charge ions or 2. Share oxygen atoms with adjacent tetrahedrons: structes of silicate minerals range from an isolated silicate structre, to framework silicates. Isolated silicate structure: silicate minerasl that are structured so that none of the oxygen atoms is shared by tetrahedrons. E. g. olivine: chain silicate structure: two of a tetrahedron"s oxygen atoms are shared with adjacent tetrahedrons to form a chain. Single www. notesolution. com chain silicate structures the ratio of silicon to oxygen is 1:3. The mica group and the clay group of minerals are sheet silicates. The poisitive ions are sandwhiched between the silicate sheets: framework silicate structure: when all four oxygen ions are shared by adjacent tetrahedrons. E. g. gold, copper, pure carbon, diamond and graphite. Ions of like size and charge can freely subsitute for one another: polymorphism: minerals have the same chemical composition but have different crystalline structures.

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