Sand-size grains of feldspar can be preserved in a soil profile over great time periods because of feldspar's resistance to chemical weathering.

Name: Sand-size grains of feldspar can be preserved in a soil profile over great time periods because of feldspar's resistance to chemical weathering.
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Feldspar is relatively susceptible to chemical weathering, especially when compared to minerals like quartz. It can break down into clay minerals and soluble components under weathering processes.

Sand-Size Grains of Feldspar Can Be Preserved in a Soil