Section 301 tariffs apply to a wide range of nonmetallic mineral goods from China, including ceramics, glass articles, and refractory products. Some stone and mineral articles have also been subject to antidumping orders. Importers should conduct a product-specific review against the current Section 301 lists and active AD/CVD orders before finalizing sourcing decisions.

Many nonmetallic mineral products undergo substantial transformation across multiple countries — raw mineral extraction, calcining, forming, and finishing may occur in different jurisdictions. CBP's substantial transformation test determines origin for duty purposes, and a product processed in a third country from Chinese raw materials may still be considered Chinese-origin if the processing does not constitute a substantial transformation.