It depends on the type of feldspar you're wondering about. I'm only 100% sure on one K-spar (Orthoclase) and one end-member of Plagioclase.
Orthoclase (and probably the other K-feldspars as well - Microcline and Sanidine) weather to Illite, the most stable of the clay minerals:
Orthoclase + CO2 + H2O ---> Illite + [K+ + HCO3- + SiO2]aq
Albite (the Na-end-member of the plagioclase solid solution (Anorthite is the Ca-end-member, which may well weather in the same manner) weathers to Kaolinite:
Albite + CO2 + H2O ---> Kaolinite + [Na+ + HCO3- + SiO2]aq
No, they don't.
True
chemical weathering
Which of the following is an example of chemical weathering?
Feldspar and quartz are not carbonates (carbonate minerals). They are silicates because they have Silica (Si) in the formula. Quartz is SiO2. Feldspar is a mineral group (feldspars) They have a variable composition that gneerally depends on the amount of Ca, Na or K in their chemical formula. An example of feldspar is Albite NaAlSi3O8. Carbonates have CO3 in their chemical formula. Two examples are Calcite (CaCO3) and Siderite (FeCO3).
chemical weathering
carbonation is an example of chemical weathering carbonation is an example of chemical weathering
A type of Chemical weathering that happens when water interacts with minerals.
chemical weathering
The colour of granite does in fact change. For example it will change during the weathering process where feldspar minerals will change to clay minerals such as kaolinite. If the degree of weathering is high this can significantly alter the colour of the granite.
chemical weathering
Humidity and temperature are the keys to chemical weathering (and to answer a previous poster, chemical weathering is a natural process, though human activity can affect it. Chemical weathering needs water, to act as a solvent and to transport corrosive ions so chemical weathering in arid climates, and in arctic climates (where water is frozen, and so not available) have little if any chemical weathering. Chemical processes are also (mostly) accelerated by higher temperature so the high humidity and high temperature of the tropics is the place where chemical weathering predominates . Contribution of humic acids from soils is also important, and the high rate of growth of plants in tropical climates is also a factor. While the solution of Limestones by acidified water is the most commonly quoted example, many minerals break down chemically, feldspar breaking down to clay minerals would be another important example.
Which of the following is an example of chemical weathering?
During chemical weathering, minerals in rocks can undergo a process of decomposition and transformation. This occurs as water and atmospheric gases react with the minerals, causing them to dissolve or alter their chemical composition. For example, minerals rich in iron can oxidize and form rust, while silicate minerals can break down and release their constituent elements. Ultimately, this can lead to the formation of new minerals and the release of dissolved ions into water streams.
I am a student and currently studying weathering, an example is Iron-containing minerals like magnetite, can weather to from a rust-like material called limonite.
chemical weathering
Feldspar and quartz are not carbonates (carbonate minerals). They are silicates because they have Silica (Si) in the formula. Quartz is SiO2. Feldspar is a mineral group (feldspars) They have a variable composition that gneerally depends on the amount of Ca, Na or K in their chemical formula. An example of feldspar is Albite NaAlSi3O8. Carbonates have CO3 in their chemical formula. Two examples are Calcite (CaCO3) and Siderite (FeCO3).
carbonation is an example of chemical weathering carbonation is an example of chemical weathering
Chemical weathering