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 |
