2511.20.00.00 - Natural barium carbonate (witherite)

This HTS category, 2511.20.00.00, specifically covers natural barium carbonate, also known as witherite. Witherite is a mineral form of barium carbonate and is classified here regardless of whether it has been calcined. This classification is distinct from other forms of barium compounds, such as barium oxide, which would fall under Chapter 28.

The key differentiator for this category lies in the chemical composition and natural origin of the substance. While the broader heading 2511 encompasses both barium sulfate (barytes) and barium carbonate (witherite), this particular subheading isolates natural barium carbonate. Its sibling category, 2511.10, exclusively addresses natural barium sulfate. Therefore, the classification hinges on identifying witherite as the specific mineral being imported or exported.

As a leaf node, 2511.20.00.00 has no further subcategories. Classification at this level is therefore determined by confirming the material is indeed natural barium carbonate (witherite). Practical considerations for classification may include laboratory analysis to verify its chemical composition and ascertain its natural origin, distinguishing it from synthetic barium carbonate or other barium-containing minerals.