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CLAY MINERALS - USDA

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.

and two oxygen anion groups. An aluminum, magnesium, or iron ion typically serves as the coordinating cation and is surrounded by six oxygen atoms or hydroxyl groups resulting in an eight-sided building block termed an octohedron (Fig. 1). The horizontal linkage of multiple octahedra comprises the octahedral sheet. The minerals

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  Mineral, Clay, Anions, Clay minerals

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