Chemical weathering of Silicates

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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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