Section 05 MINERAL PRODUCTS 25 SALT;SULPHUR;EARTHS AND STONE;PLASTERING MINERALS, LIME AND CEMENT 25 12 SPECIFIC GRAVITY OF 1 OR LESS. 25 12 00 SILICEOUS FOSSIL MEALS AND SIMILAR SILIC. EARTHS, WHETHER OR NOT CALCINED Commodity Code Description 25 12 00 00 SILICEOUS FOSSIL MEALS AND SIMILAR SILIC. EARTHS, WHETHER OR NOT CALCINED