graniteware

from The American Heritage® Dictionary of the English Language, 4th Edition

• n. Iron utensils with a mottled enamel resembling granite.
• n. Earthenware with a speckled glaze resembling granite.

from Wiktionary, Creative Commons Attribution/Share-Alike License

• n. Ironware that has been coated with a layer of vitreous enamel with a swirled or speckled pattern resembling granite.
• n. Pottery with the same type of enamel coating.

from the GNU version of the Collaborative International Dictionary of English

• n. A Kind of ironware, coated with an enamel resembling granite.
• n. a kind of ironware with stone gray enamel.

from The Century Dictionary and Cyclopedia

• n. Any fine pottery decorated by a more or less exact imitation of the speckled surface of granite; specifically, one of Josiah Wedgwood's pebble-wares, described by him in 1770 as “barely sprinkled with blue” and ornaments gilt.” See pebbleware.
• n. A fine pottery similar to ironstone china, referring to its supposed hardness.
• n. A variety of enameled ironware much used for utensils of cookery, in which the enamel is gray and stone-like, and very durable.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• n. a kind of stone-grey enamelware