2530.20 - Kieserite, epsom salts (natural magnesium sulfates):

This HTS category, 2530.20, specifically covers natural magnesium sulfates, commonly known as kieserite and epsom salts. These minerals are characterized by their crystalline structure and are found naturally. Kieserite is a hydrated magnesium sulfate that often occurs in evaporite deposits, while epsom salts refer to hydrated magnesium sulfate that is typically used for medicinal or horticultural purposes.

Distinguishing this category from its siblings, 2530.10.00.00, is crucial. While both fall under "Mineral substances not elsewhere specified or included," 2530.10.00.00 is reserved for vermiculite, perlite, and chlorites, which are distinct types of minerals with different chemical compositions and physical properties. Category 2530.90, "Other," serves as a residual category for other unlisted mineral substances not fitting into more specific provisions.

Within the 2530.20 classification, further subdivisions exist to differentiate between the two primary forms of natural magnesium sulfates. The subcategory 2530.20.10.00 applies specifically to kieserite, recognizing its particular geological occurrence and composition. The subcategory 2530.20.20.00 is designated for epsom salts, acknowledging their common identification and applications, even though they are chemically similar to kieserite. This breakdown aids in precise import and export declarations based on the specific form of the magnesium sulfate being traded.