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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If chemically refined or calcined to high purity
Processed borates separated or purified beyond natural concentration fall under Chapter 28 as inorganic chemicals, not raw minerals.
If mixed with other earth minerals or low boron content
Blended or impure mineral products without dominant borate characteristics are classified in heading 2530 for other mineral substances.
If in iron ore concentrates with trace borates
Borates as incidental components in metal ore concentrates follow the principal material under Chapter 26 ore headings.
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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
• 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
Related Products under HTS 2528.00.00.10
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.