2511.10 - Natural barium sulfate (barytes):

This HTS category, 2511.10, specifically covers natural barium sulfate, commonly known as barytes. Barytes are naturally occurring minerals valued for their high density and chemical inertness. They are typically found in sedimentary deposits and are distinguished by their high percentage of barium sulfate. This classification applies to barytes in their raw, unworked state, as well as those that have undergone basic processing such as crushing or screening.

Distinguishing this category from its sibling, 2511.20, is crucial. While both fall under the broader heading for barium compounds, 2511.10 exclusively deals with barium sulfate, whereas 2511.20 covers natural barium carbonate (witherite). The chemical composition is the primary differentiator; barytes are primarily BaSO₄, while witherite is BaCO₃.

The subcategories under 2511.10 further refine the classification based on the physical form of the barytes. 2511.10.10.00 designates ground barytes, indicating that the mineral has been reduced in particle size through grinding. The residual category, 2511.10.50.00, encompasses all other forms of natural barium sulfate not specifically classified as ground, such as lump, crushed, or screened barytes that have not been finely ground.