2529.30.00.50 - Other

This HTS classification, 2529.30.00.50, covers "Other" minerals within the broader category of feldspar, leucite, nepheline, and nepheline syenite. Specifically, it acts as a residual category for minerals that fall under this general description but are not classified as nepheline syenite (HTS 2529.30.00.10). This includes materials such as leucite and other forms of nepheline that do not meet the specific definition of nepheline syenite.

The distinction from the sibling category, 2529.30.00.10, is crucial for accurate classification. Nepheline syenite is a specific igneous rock characterized by its composition, typically containing nepheline, feldspar, and alkali feldspar. This residual "Other" category is for minerals that share some characteristics with the broader group but are not precisely identified as nepheline syenite, such as pure leucite, which is a distinct potassium aluminum silicate mineral.

As this is a leaf node, there are no further subcategories. Therefore, classification under 2529.30.00.50 hinges on a thorough analysis of the mineral's composition and physical properties to confirm it is not specifically covered by other headings within Chapter 25, particularly the more precisely defined categories of feldspar, leucite, nepheline, and nepheline syenite. Importers and exporters should consult specific mineralogical analyses and the Harmonized System Explanatory Notes for detailed guidance.