Transcription of CLAY MINERALS - USDA
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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. Primary MINERALS format elevated temperatures and pressures, and are usuallyderived from igneous or metamorphic rocks.
Clay minerals are generally classified into three layer types based upon the number and arrangement of tetrahedral and ... two-sheet mineral type is represented by the kaolin group, with the general formula Al2Si205(0H)4. Kaolinite, the most common mineral in …
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