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Chemical weathering of Silicates




  • The most important silicates are quartz, feldspar and certain Ferro magnesium minerals
     

    Weathering products of common silicate minerals

    Minerals

    Composition

    Decomposition products

    Minerals

    Others

    Olivine

    (Fe, Mg)2SiO2

    serpentine, limonitehaematite, quartz

    Some Si in solution, carbonates of Fe and Mg

    Pyroxenes

    Fe, Mg

    Clay, calcite, limonite

    Some Si in solution, carbonates of Ca and Mg

    Amphibole

    Ca- silicates

    Haematite, quartz

    -do –

    Biotite

    Al

     

    -do –

    Plagioclase

    Calcic

    Clay, quartz, calcite

    Some Si in solution, Na and Ca carbonates

    Sodic

     

    -do-

    Orthoclase

    Potassic

    Clay, quartz

    Some Si in solution, potassium carbonate

    Quartz

     

    Quartz grains

    Some Si in solution

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