Natural calcium borates
Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 percent of H3BO3 calculated on the dry weight > Natural calcium borates
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 2528.00.00.10
Colemanite Ore
Colemanite is a naturally occurring white to colorless calcium borate mineral (Ca2B6O11·5H2O) mined primarily from evaporite deposits in California and Turkey. It falls under HTS 2528.00.0010 as a natural calcium borate, unprocessed except for basic concentration, used as a source of boron in various industries. This statistical suffix specifically covers calcium borate variants like colemanite without chemical separation from brine.
Ulexite Calcium Borate
Ulexite, known as TV rock, is a hydrated sodium calcium borate mineral (NaCaB5O6(OH)6·5H2O) that appears fibrous and translucent, sourced from boron-rich lake beds. Classified under HTS 2528.00.0010 for its natural calcium borate composition, it is exported as crude ore for boron extraction. The code applies to concentrates not chemically altered from natural deposits.
Priceite Natural Borate
Priceite is a rare calcium borate hydroxide mineral (Ca4MgB10O19(OH)10·6H2O) found in boron deposits, appearing as yellow-brown crystals. It qualifies for HTS 2528.00.0010 as a natural calcium borate concentrate from mining operations, not including brine-extracted forms. Primarily used in research and specialty boron applications.
Hydroboracite Crude Concentrate
Hydroboracite (CaMgB6O11·6H2O) is a white fibrous calcium magnesium borate mineral extracted from evaporite basins and concentrated via flotation. It is classified in HTS 2528.00.0010 as natural calcium borates, provided no brine separation occurs. Common in fertilizers and glass flux production.
Pandermite Calcium Borate Lump
Pandermite, a variety of colemanite, is supplied as natural calcium borate lumps from Turkish deposits, with B2O3 content around 30-35%. HTS 2528.00.0010 covers this uncalcined, non-brine form for boron sourcing in detergents and enamels. It remains in raw mineral state post basic crushing.