BRICKS, BLOCKS, TILES AND OTHER CERAMIC GOODS OF SILICEOUS FOSSIL MEALS (FOR EXAMPLE, KIESELGUHR, TRIPOLITE OR DIATOMITE) OR OF SIMILAR SILICEOUS EARTHS
Bricks, blocks, tiles and other ceramic goods of siliceous fossil meals (for example, kieselguhr, tripolite or diatomite) or of similar siliceous earths.