AnaEE Thesaurus


% or g Kg-1 a loose earthy extremely fine grained natural sediment or soft rock composed primarily of clay size or colloidal particles and characterized by high plasticity and by a considerable content of clay mineral and subordinate amounts of finely divided quartz decomposed feldspar carbonates ferruginous matter and other impurities it forms a plastic moldable mass when finely ground and mixed with water retains its shape on drying and becomes firm rocklike and permanently hard on heating or firing