6802.91 - Marble, travertine and alabaster:

HTS Code 6802.91 encompasses worked monumental or building stone, specifically marble, travertine, and alabaster, that are not classified under heading 6801. This category includes finished articles made from these natural stones, as well as mosaic cubes and similar items. Artificially colored granules, chippings, and powders derived from these stones are also included.

This classification distinguishes itself from its siblings by its focus on calcareous stones and alabaster. For instance, 6802.92.00.00 specifically covers "Other calcareous stone," which would include materials like limestone and dolomite if they are not marble or travertine. Similarly, 6802.93.00 is reserved for granite, a distinct igneous rock. HTS 6802.99.00 serves as a residual category for any other types of worked stone not otherwise specified.

Within HTS 6802.91, further subdivisions exist to provide more granular classification. The category "Marble" captures various types of metamorphic rock known for its veining and characteristic polish. "Travertine" is a form of limestone deposited by mineral springs, often recognized by its layered appearance. Finally, "Alabaster" (HTS 6802.91.30.00) refers to a softer, translucent variety of gypsum or calcite, often used for decorative objects and sculpture. This hierarchical structure allows for precise identification based on the specific mineral composition and geological origin of the worked stone.