2513 - Pumice; emery; natural corundum, natural garnet and other natural abrasives, whether or not heat-treated:

HTS 2513 encompasses a variety of naturally occurring abrasive materials. This category specifically includes pumice, emery, natural corundum, natural garnet, and other natural abrasives. These substances are classified here regardless of whether they have undergone heat treatment. The primary characteristic for inclusion in this heading is their inherent abrasive quality, making them suitable for grinding, polishing, or other surface preparation tasks.

Distinguishing HTS 2513 from its sibling categories within Chapter 25 is crucial for accurate classification. Unlike heading 2512 (Diatomaceous earths and similar siliceous earths, whether or not calcined), which focuses on specific types of siliceous earths for filtration or inert filler purposes, 2513 is dedicated to materials primarily valued for their hardness and ability to wear down other substances. It also differs from headings covering worked stone (Chapter 68) as it pertains to the natural, unworked or minimally processed abrasive minerals themselves, rather than finished abrasive articles like grinding wheels or sandpaper.

Within HTS 2513, further subdivisions distinguish between pumice stone and other natural abrasives. Subheading 2513.10 specifically addresses pumice stone, a porous, volcanic rock known for its lightweight and abrasive properties. The remaining subheadings under 2513.20 group together emery, natural corundum, natural garnet, and other natural abrasives, acknowledging their common function as abrasive agents. This hierarchical structure allows for precise identification based on the specific mineral composition and primary abrasive application.