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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If pumiceous or siliceous tuff rather than calcareous
Pumice and similar volcanic stones fall under 2513, distinct from calcareous.
If merely cut but with ornamental finishing
Minimal working can trigger Chapter 68 for monumental articles.
If mixed with earth colors or other minerals
Heading 2530 covers mineral mixtures including micaceous oxides.
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Import Tips & Compliance
• Geological assay required to confirm calcareous (not siliceous) composition
• Label with quarry origin to trace for quality disputes or recalls
• Test for acid solubility; high-calcium content validates 2515 classification
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.
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.
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.