Ulexite Sodium Calcium Borate Mineral from Mexico
Ulexite, known as TV rock, is a naturally hydrated sodium calcium borate ore concentrated from deposits in California and Chile. Classified under HTS 2528.00.00 as a natural borate not from brine, it's supplied in powdered or granular form for industrial flux applications. Its fibrous crystal structure is a hallmark of unaltered natural borates.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Require geological assay reports confirming ulexite composition and natural origin to prevent reclassification as synthetic
• Label shipments clearly as 'natural borates' and include moisture content analysis, especially for hydrated forms