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A hard, earthy ore of iron. Clay ironstone. See under Clay. -- Ironstone china, a hard white pottery, first made in England during the 18th century.

sandstone (Geol.), a sandstone containing much clay. -- Argillaceous iron ore, the clay ironstone. -- Argillaceous schist or state. See Argillite.

A variety of clay ironstone, in Staffordshire, England, used for making tools.

ning red when burned. -- Clay cold, cold as clay or earth; lifeless; inanimate. -- Clay ironstone, an ore of iron consisting of the oxide or carbonate of iron mixed with clay or sand. -- Clay marl, a whitish, smooth, chalky clay. -- Clay mill, a mill for mixing and tempering clay; a pug mill. -- Clay pit, a pit wh…

A concretionary nodule of clay ironstone, of the size of a walnut or larger, so called by the ancients, who believed that the eagle transported these stones to her nest to facilitate the laying of her eggs; aëtites.

A clay ironstone found in Ceylon.