2516.20 - Sandstone:

This HTS category, 2516.20, specifically covers sandstone, a sedimentary rock composed primarily of mineral or rock fragments. It is intended for use as monumental or building stone. The classification applies whether the sandstone is in its natural state or has undergone basic shaping processes.

Sandstone at this heading is distinguished from its siblings by its specific geological composition. While other entries under 2516.20 encompass granite, porphyry, basalt, and "other" monumental or building stones, this sub-heading is exclusively for sandstone, characterized by its granular texture and often porous nature, typically formed from the cementation of sand-sized mineral, rock, or organic fragments.

The subcategories under 2516.20 further refine the classification based on the degree of processing. 2516.20.10.00 includes sandstone that is crude or only roughly trimmed, meaning minimal shaping has occurred. In contrast, 2516.20.20.00 covers sandstone that has been more precisely processed, specifically into blocks or slabs of a rectangular or square shape through sawing or other cutting methods, indicating a higher degree of preparation for building or monumental use.