2528.00.00.10/Colemanite Ore/Japan

Colemanite Ore from Japan

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.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter

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Import Tips

• Verify mineral composition via assay certificates to confirm calcium borate content exceeds boron thresholds; ensure no brine separation processing to avoid reclassification

• Obtain mining origin documentation for potential preferential tariff treatments under USMCA or similar agreements

• Watch for contamination with other salts that could trigger Chapter 28 chemical headings