2519.10.00.00 - Natural magnesium carbonate (magnesite)

This HTS category, 2519.10.00.00, specifically covers natural magnesium carbonate, commonly known as magnesite. Magnesite is a mineral composed of magnesium carbonate (MgCO₃) and is typically found in sedimentary and metamorphic rocks. Its classification here focuses on the raw, naturally occurring form of this mineral before it has undergone significant processing or transformation, such as calcination or fusion.

Within Chapter 25, which deals with salt, sulfur, earths, and stone, this heading distinguishes itself from its sibling category, 2519.90 ("Other"). While 2519.90 encompasses other forms of magnesium oxide and carbonate, including fused magnesia and dead-burned magnesia (which have been processed through high-temperature treatments), 2519.10.00.00 is exclusively for the naturally occurring, unprocessed magnesite. The key differentiator lies in the degree of thermal processing; this category excludes products that have been calcined or sintered.

As a leaf node in the HTS structure, 2519.10.00.00 does not have further subcategories. Therefore, classification into this specific code relies on identifying the material as natural magnesium carbonate (magnesite) and confirming it has not been subjected to processes that alter its chemical or physical state beyond basic extraction and preparation. Classification professionals should verify that the product is indeed the naturally occurring mineral and not a manufactured product derived from magnesite.