MINEROLOGY OF NATIVE WESTERN NORTH CAROLINA CLAYS USED IN CERAMIC STUDIOS
At the start of this study, clay samples were harvested from the bank of the Little Tennessee River in Cowee, NC, and the bank of an unnamed pond in Cherokee, NC. These sites had been previously identified by local potters as sources of viable clays. The clays were then refined using traditional methods, made into thin sections, and evaluated using a polarizing microscope. The analysis revealed that both clays contained significant amounts of quartz, muscovite mica, kaolinite, and iron oxides. While the types of minerals in the two clays are virtually the same, the proportions and specific characteristics of the grains varied between the two samples. Overall, the Cowee clay was more practical for use in the ceramic studio largely due to its fine texture and balance of minerals (high kaolinite content, abundant mica and oxides, small amounts of quartz). Analysis of the Cherokee clay revealed that it lacked sufficient flux and plasticity. This clay could be amended with soda feldspar, which would lower the firing temperature, and bentonite clay, which would improve plasticity. Continued tests during the amending process would reveal the impact of adding incremental amounts of supplements to the clay bodies. This would further contribute to the understanding of what mineral characteristics and proportions make a local clay a viable studio ceramic.