Nepheline Syenite Lumps
Coarse lumps of nepheline syenite rock, typically 2-10 cm, mined for crushing into flux material for porcelain and tile production. Falls under HTS 2529.30.00 as unworked nepheline syenite, suitable for direct industrial processing. Low iron content ensures clean burning in white ceramics.
Import Duty Rates by Country of Origin
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If sized as construction aggregate rather than flux
Construction end-use as gravel supersedes mineral specificity per Chapter Note.
If pre-fired into refractory grog
Thermal processing into refractory materials moves to Chapter 69.
If ground to specific grit for abrasives
Articles of nepheline syenite worked into abrasive form fall under 6809.
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Import Tips & Compliance
• Include quarry origin certificates; specify 'not calcined' status to avoid 2507/2508 clay headings
• Use sturdy bulk bags to prevent breakage that could imply processing during transit
• Test for consistent alkali content; variations may trigger reclassification as 2530 mixed minerals
Related Products under HTS 2529.30.00
Nepheline Syenite Powder
Finely ground nepheline syenite used primarily as a fluxing agent in ceramic and glass manufacturing to lower melting temperatures. This natural aluminosilicate mineral falls under HTS 2529.30.00 as unprocessed nepheline syenite in powdered form, distinct from synthetic materials. It provides silica, alumina, and alkalis essential for glaze and body formulations.
Leucite Ore Concentrate
Concentrated leucite (potassium aluminosilicate) ore extracted from volcanic deposits, used in specialty ceramics and as a potassium source in fertilizers. Classified under HTS 2529.30.00 as crude or beneficiated leucite, not chemically altered. Its high potash content makes it valuable for glass batch formulations.
Feldspar-Nepheline Syenite Blend
Natural blend of nepheline syenite and feldspar (30-70% nepheline content) used in sanitaryware and electrical porcelain production. Classified under HTS 2529.30.00 due to dominant nepheline syenite characteristics and flux properties. Provides balanced vitrification for high-strength ceramics.
Leucite Crystals for Research
Hand-selected leucite crystals from volcanic deposits, used in geological research and as reference standards in mineralogy labs. HTS 2529.30.00 covers these unworked natural leucite specimens under 2.5g each. Ideal for X-ray diffraction analysis due to perfect cubic habit.
Micronized Nepheline Syenite Filler
Ultra-fine (<10 micron) nepheline syenite powder used as functional filler in paints, coatings, and plastics for matting and reinforcement. Still classified under HTS 2529.30.00 as physically processed (ground) but chemically unchanged mineral. Inert, low oil absorption enhances coating performance.
Nepheline Syenite for Glass Batch
Coarse-ground nepheline syenite specifically graded for container glass and flat glass production as primary source of alkalis and alumina. HTS 2529.30.00 applies to this industrial mineral flux before batch mixing. Reduces soda ash usage while maintaining glass durability.