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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

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13y ago
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8y ago

No, they don't.

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11y ago

True

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Q: Is the change from feldspar to clay minerals an example of chemical weathering?
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