Slides 3b.docx - Silicates • Minerals comprised of silicon ions(Si4 surrounded by four oxygen ions(O2 and represented by the formula(SiO4)4 Silicate

Slides 3b.docx - Silicates • Minerals comprised of...

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Silicates Minerals comprised of silicon ions (Si 4+ ) surrounded by four oxygen ions (O 2- ) and represented by the formula (SiO 4 ) 4- General formula for silicates: (SiO 4 ) 4- + cations (Mg 2+ , Fe 2+ , Ca 2+ , Na + , K + ) The basic building block is the Silicon- Oxygen Tetrahedron Silica Tetrahedra Also Bond Together Into Chains, Double Chains, Sheets Or 3-dimensional Framework Silicon-oxygen tetrahedron Silicate Structures: Independent Tetrahedron Cations link individual tetrahedra in the crystal structure Silicate Structures: Single And Double Chains of Tetrahedra Structure of the Mineral Olivine 9/26/2016 1 9/26/2016 1 9/26/2016 1 9/26/2016 1 9/26/2016 1 9/26/2016 1 Feldspars Are Examples of Framework Silicates Micas Are Examples of Sheet Silicates Silicate Structures: Framework Silicates Comprised of Three Dimensional Networks of Tetrahedra Plagioclase Feldspar With Striations Silicate Structures: Sheets of Tetrahedra 9/26/2016 2
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Quartz Is A Common Framework Silicate • There are different carbonate
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