Section V — Mineral products
Chapter 25 — Salt; sulfur; earths and stone; plastering materials, lime and cement
Heading
2528 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 % of H3BO3 calculated on the dry weight.
Common commodities
Natural tincal oreKernite crystals from miningRaw colemanite depositsUlexite mining productCrude boracite rocksMined pandermite resourcesPriceite extracted from quarriesRasorite natural mineralsSodium borate ores in their raw stateQuarried crude boric acid deposits