Sodium Feldspar Lumps
Sodium feldspar (albite) in lump form is extracted from pegmatite deposits and used primarily in glass manufacturing as a source of alumina and silica. Classified under HTS 2529.10.00.00 as raw feldspar, it has undergone minimal processing like crushing to lump size without chemical alteration.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing significant nepheline impurities
Nepheline-bearing feldspar mixtures may classify under 2528 as leucite, nepheline, or nepheline syenite.
If for use in mineral fillers or extenders
Feldspar used as earth colors or fillers aligns with heading 2530 for miscellaneous mineral substances.
If sold as pre-ground panels or slabs
Worked feldspar into shapes classifies as worked stone under Chapter 68.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Include mineral composition analysis (Na2O, Al2O3 content) in import docs to substantiate feldspar classification
• Declare exact particle size distribution to distinguish from powders that might edge into other categories
• Check for radioactive impurities common in feldspar deposits, as high levels trigger additional NRC regulations
Related Products under HTS 2529.10.00.00
Potassium Feldspar Powder
Potassium feldspar, also known as orthoclase, is a common rock-forming mineral mined and ground into powder for use as a flux in ceramic glazes and porcelain production. This product falls under HTS 2529.10.00.00 as it is natural feldspar that has been crushed and milled but remains chemically unchanged, classified specifically as feldspar in Chapter 25.
Ceramic Grade Feldspar
High-quality feldspar graded for ceramics, with low iron content to prevent discoloration in tiles and sanitaryware. It is natural feldspar plug for sanitaryware glazes under HTS 2529.10.00.00, as it remains an unprocessed aluminosilicate mineral.
Glass Grade Feldspar Powder
Feldspar finely milled to uniform particle size for soda-lime glass production, providing network formers without further refinement. Falls under HTS 2529.10.00.00 as it's crude feldspar, not chemically synthesized.
Leucite Ore Feldspar
Feldspar extracted from leucite-rich volcanic rocks, used in specialty ceramics requiring high potash flux. Classified as feldspar under HTS 2529.10.00.00 despite leucite association, as primary mineral is feldspar.
Nepheline Syenite Feldspar Blend
Blended feldspar from nepheline syenite deposits, offering low iron and high alkali for paint extenders and ceramics. HTS 2529.10.00.00 applies to the dominant feldspar component in this natural mineral product.