2530.90 - Other:

This HTS category, 2530.90, encompasses a diverse range of mineral substances that are not specifically provided for in other headings within Chapter 25. These are generally natural mineral products that, while having commercial value, do not fit into more precisely defined categories such as salt, sulfur, earths, stone, plastering materials, lime, or cement. The classification here is for those miscellaneous mineral materials of a non-specified nature.

Distinct from its sibling categories, 2530.90 covers items not falling under the specific definitions of unexpanded vermiculite, perlite, chlorites (2530.10), or natural kieserite and natural epsom salts (2530.20). While those siblings represent distinct mineral groups with unique properties and uses, 2530.90 acts as a residual category for other unclassified mineral substances.

Further subdivisions within this category clarify the scope of "Other" mineral substances. For instance, 2530.90.10 specifically includes natural cryolite and natural chiolite, which are distinct aluminum-containing minerals. Similarly, 2530.90.20 addresses natural micaceous iron oxides, a particular type of iron ore with lamellar structure. The remaining 2530.90.80 category serves as the ultimate residual provision for any other mineral substances not otherwise specified within this heading or elsewhere in the tariff schedule.