Tufa Stone Slabs
Porous calcareous tufa stone slabs, naturally deposited and sawn into rectangular blocks for ornamental building stone. Exhibits specific gravity ≥2.5, used in garden walls and facades. Qualifies under HTS 2515.20.00.00 as other calcareous monumental stone.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If used as roofing, facing or damp course slates
Chapter exclusions direct slate-like calcareous products to 6803.
If resembling travertine marble varieties
Borderline calcareous stones may be assessed as marble subheadings.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Document natural vs. artificial formation to prevent confusion with agglomerated products
• Ensure slabs remain rectangular without decorative cuts to stay in unworked category
• Quarantine for pests common in porous natural stone; fumigate prior to export
Related Products under HTS 2515.20.00.00
Alabaster Blocks
Roughly trimmed alabaster blocks cut into rectangular shapes for monumental or building use, with an apparent specific gravity of 2.5 or more. This calcareous stone is prized for its fine grain and ability to take a high polish, commonly used in sculptures and decorative architecture. Classified under HTS 2515.20.00.00 as unworked alabaster suitable for further processing into finished products.
Travertine Slabs
Calcareous travertine stone slabs, roughly sawn into rectangular blocks for building facades and monumental works, meeting the 2.5+ specific gravity requirement. Though often associated with marble headings, these 'other' calcareous stones are used in flooring and cladding. Fits HTS 2515.20.00.00 when not qualifying as marble.
Oolitic Limestone Blocks
Oolitic limestone, a calcareous building stone composed of spherical calcite grains, cut into rectangular slabs for construction and monuments. With specific gravity over 2.5, it's used in historic restoration projects. HTS 2515.20.00.00 covers this as 'other' calcareous stone, roughly trimmed.
Calcareous Tuff Blocks
Calcareous tuff, a volcanic calcareous stone, roughly cut into rectangular blocks for monumental sculptures and construction. Meets density criteria for heading 2515 with specific gravity 2.5+. HTS 2515.20.00.00 applies to this other calcareous building stone.
Lithographic Limestone Slabs
Fine-grained lithographic limestone slabs, a dense calcareous stone sawn rectangular for building and potential printing use. Specific gravity exceeds 2.5, classifying as other calcareous monumental stone under HTS 2515.20.00.00.
Coquina Building Stone Blocks
Coquina, shell-derived calcareous limestone, trimmed into rectangular blocks for coastal architecture and monuments. Density ≥2.5 qualifies it under HTS 2515.20.00.00 as other calcareous building stone.