Transcription of CLAY MINERALS - USDA
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clay MINERALSCD. BartonUnited States Department of Agriculture Forest Service, Aiken,South Carolina, KarathanasisUniversity of Kentucky, Lexington, Kentucky, MINERALS refers to a group of hydrous aluminosili-cates that predominate the clay -sized (<2 |xm) fraction ofsoils. These MINERALS are similar in chemical and structuralcomposition to the primary MINERALS that originate fromthe Earth's crust; however, transformations in thegeometric arrangement of atoms and ions within theirstructures occur due to weathering. Primary MINERALS format elevated temperatures and pressures, and are usuallyderived from igneous or metamorphic rocks.
190 Clay Minerals presence of weakly bound cations, water, or polar organic molecules in the interlayer region. Smectites generally refer to a group of expandable
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