2529.30.00.10 - Nepheline syenite

This HTS classification covers nepheline syenite, a naturally occurring igneous rock composed primarily of nepheline and feldspathoid minerals. It is a granular, crystalline material valued for its high alumina and alkali content, and low iron content. Nepheline syenite finds extensive use in the manufacturing of glass, ceramics, and as a filler in paints, plastics, and rubber due to its fluxing properties and contribution to vitrification.

Within its hierarchical level, this HTS code specifically identifies nepheline syenite, distinguishing it from other related mineral substances that may share some compositional or geological similarities. The sibling category, 2529.30.00.50, encompasses "Other" materials within this broader group, meaning this specific code is for situations where the product is definitively identified as nepheline syenite and not a mixture or a different mineral in the same family.

As this is a leaf node, there are no further subcategories within the HTS. Therefore, classification under 2529.30.00.10 hinges on the accurate identification of the imported material as nepheline syenite, based on its mineralogical composition and typical industrial applications. Customs officers will rely on product documentation, laboratory analysis, and commodity knowledge to ensure correct classification.